A protester watchman looks into a telescope from atop smashed tollbooths at Hong Kong’s Cross Harbour Tunnel, a major road link joining Hong Kong island with the Kowloon peninsula, China November 16, 2019. REUTERS/James Pomfret

A police officer speaks to the media and members of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG), after detaining FUNPEG members at the Palo Blanco tollbooth on a road leading to Acapulco, in Chilpancingo, in the Mexican state of Guerrero, January 28, 2015. A group of 14 students were detained by federal police for taking over the tollbooth and collecting "fees" from the drivers, and were released upon negotiation with the officers, local media reported. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST MEDIA)

Members of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) board a bus after FUNPEG members detained by federal police officers were released, at the Palo Blanco tollbooth on a road leading to Acapulco, in Chilpancingo, in the Mexican state of Guerrero, January 28, 2015. A group of 14 students were detained by federal police for taking over the tollbooth and collecting "fees" from the drivers, and were released upon negotiation with the officers, local media reported. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Members of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) board a bus after federal police officers released FUNPEG members who had been detained, at the Palo Blanco tollbooth on a road leading to Acapulco, in Chilpancingo, in the Mexican state of Guerrero, January 28, 2015. A group of 14 students were detained by federal police for taking over the tollbooth and collecting "fees" from the drivers, and were released upon negotiation with the officers, local media reported. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

A member of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) looks on while waiting for other members who were detained by federal police officers to be released, at the Palo Blanco tollbooth on a road leading to Acapulco, in Chilpancingo, in the Mexican state of Guerrero, January 28, 2015. A group of 14 students were detained by federal police for taking over the tollbooth and collecting "fees" from the drivers, and were released upon negotiation with the officers, local media reported. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Members of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) are seen after they were detained by federal police officers at the Palo Blanco tollbooth on a road leading to Acapulco, in Chilpancingo, in the Mexican state of Guerrero, January 28, 2015. A group of 14 students were detained by federal police for taking over the tollbooth and collecting "fees" from the drivers, and were released upon negotiation with the officers, local media reported. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

A view of tollbooths on the Henri Konan Bedie toll bridge, which was named after a former Ivory Coast president, in Abidjan December 15, 2014. The first toll bridge of Ivory Coast and third bridge of Abidjan links the two major Abidjan districts of Marcory and Riviera, and will be inaugurated on December 16, according to the African Development Bank which partially funded the bridge. REUTERS/Luc Gnago (IVORY COAST - Tags: SOCIETY TRANSPORT BUSINESS)

Students from Ayotzinapa Teacher Training College take part in a blockade of a Palo Blanco tollbooth near pictures of missing students, along a road leading to Acapulco, near Chilpancingo, in the southern Mexican state of Guerrero, October 20, 2014. The students are demanding answers about the fate of 43 missing trainee teachers from the Ayotzinapa Teacher Training College, whom authorities fear were massacred by police in league with gang members. The students went missing in Iguala, in the southwestern state of Guerrero on September 26 after clashing with police and masked men, and dozens of police have been arrested in connection with the case - which has sent shockwaves across Mexico. Authorities say many of the missing students were abducted by police.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Two men, who members of teachers' union CETEG (State Coordinator of Teachers of Guerrero) say are government intelligence agents, are presented and delivered to Federal Public Ministry in downtown Chilpancingo, in the Mexican state of Guerrero, October 16, 2014. CETEG members caught the two men during a blockade of the tollbooth in the road to Acapulco, to demand the government to find the 43 school students missing since last month in Iguala on September 26.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Two men, who members of teachers' union CETEG (State Coordinator of Teachers of Guerrero) say are government intelligence agents, are presented and delivered to Federal Public Ministry in downtown Chilpancingo, in the Mexican state of Guerrero, October 16, 2014. CETEG members caught the two men during a blockade of the tollbooth in the road to Acapulco, to demand the government to find the 43 school students missing since last month in Iguala on September 26.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

A man, who members of teachers' union CETEG (State Coordinator of Teachers of Guerrero) say is a government intelligence agent, is presented and delivered to Federal Public Ministry in downtown Chilpancingo, in the Mexican state of Guerrero, October 16, 2014. CETEG members caught the two men during a blockade of the tollbooth in the road to Acapulco, to demand the government to find the 43 school students missing since last month in Iguala on September 26.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Two men (2nd L and C), who members of teachers' union CETEG (State Coordinator of Teachers of Guerrero) say are government intelligence agents, are presented and delivered to Federal Public Ministry in downtown Chilpancingo, in the Mexican state of Guerrero, October 16, 2014. CETEG members caught the two men during a blockade of the tollbooth in the road to Acapulco, to demand the government to find the 43 school students missing since last month in Iguala on September 26.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Two men, who members of teachers' union CETEG (State Coordinator of Teachers of Guerrero) say are government intelligence agents, are presented and delivered to Federal Public Ministry in downtown Chilpancingo, in the Mexican state of Guerrero, October 16, 2014. CETEG members caught the two men during a blockade of the tollbooth in the road to Acapulco, to demand the government to find the 43 school students missing since last month in Iguala on September 26.
REUTERS/Henry Romero (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)

Two men, who members of teachers' union CETEG (State Coordinator of Teachers of Guerrero) say are government intelligence agents, are presented and delivered to Federal Public Ministry in downtown Chilpancingo, in the Mexican state of Guerrero, October 16, 2014. CETEG members caught the two men during a blockade of the tollbooth in the road to Acapulco, to demand the government to find the 43 school students missing since last month in Iguala on September 26.
REUTERS/Henry Romero (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Two men, who members of teachers' union CETEG (State Coordinator of Teachers of Guerrero) say are government intelligence agents, are presented and delivered to Federal Public Ministry in downtown Chilpancingo, in the Mexican state of Guerrero, October 16, 2014. CETEG members caught the two men during a blockade of the tollbooth in the road to Acapulco, to demand the government to find the 43 school students missing since last month in Iguala on September 26.
REUTERS/Henry Romero (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)

Students from the Ayotzinapa Teacher Training College take part in a blockade of a Palo Blanco tollbooth with pictures of missing students, along a road leading to Acapulco, demanding the government find 43 of the school's students, missing since last month's deadly clashes, near in Chilpancingo, in the southern Mexican state of Guerrero, October 15, 2014. None of the 28 bodies found in a mass grave in restive southwestern Mexico belongs to a group of 43 missing students, Mexico's attorney general said on Tuesday. The students, who are feared to have been massacred by police in league with gang members, went missing in the southwestern state of Guerrero on Sept. 26.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

A trainee teacher of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) stands near printouts of Ayotzinapa Teacher Training College students missing after last month's deadly clashes, during a blockage of a Palo Blanco tollbooth along a road leading to Acapulco, October 9, 2014. Thousands marched in Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police. The students from the teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains. Mexican President Enrique Pena Nieto vowed on Monday to identify those behind the massacre and make sure they face justice. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Printouts of Ayotzinapa Teacher Training College students, missing after last month's deadly clashes in Iguala, are plastered on a Palo Blanco tollbooth along a road leading to Acapulco, during a blockage by trainee teachers of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG), October 9, 2014. Thousands marched in Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police. The students from the teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains. Mexican President Enrique Pena Nieto vowed on Monday to identify those behind the massacre and make sure they face justice. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW TPX IMAGES OF THE DAY)

Trainee teachers of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) request for cooperation from a vehicle during a blockage of a Palo Blanco tollbooth along a road leading to Acapulco, in solidarity with the Ayotzinapa Teacher Training College in Iguala, where students remain missing after last month's deadly clashes, October 9, 2014. Thousands marched in Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police. The students from the teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains. Mexican President Enrique Pena Nieto vowed on Monday to identify those behind the massacre and make sure they face justice. At top are printouts of some of tge missing students. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Trainee teachers of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) stand near printouts of Ayotzinapa Teacher Training College students missing after last month's deadly clashes, as they block a Palo Blanco tollbooth along a road leading to Acapulco, October 9, 2014. Thousands marched in Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police. The students from the teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains. Mexican President Enrique Pena Nieto vowed on Monday to identify those behind the massacre and make sure they face justice. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

A trainee teacher of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) stands near printouts of Ayotzinapa Teacher Training College students missing after last month's deadly clashes, during a blockage of a Palo Blanco tollbooth along a road leading to Acapulco, October 9, 2014. Thousands marched in Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police. The students from the teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains. Mexican President Enrique Pena Nieto vowed on Monday to identify those behind the massacre and make sure they face justice. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Trainee teachers of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) stand under printouts of Ayotzinapa Teacher Training College students missing after last month's deadly clashes, as they block a Palo Blanco tollbooth along a road leading to Acapulco, October 9, 2014. Thousands marched in Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police. The students from the teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains. Mexican President Enrique Pena Nieto vowed on Monday to identify those behind the massacre and make sure they face justice. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Trainee teachers of the United Front of Public Guerrero State Teacher Training Schools (FUNPEG) hold a sign as they protest in solidarity with the Ayotzinapa Teacher Training College in Iguala, where students remain missing after last month's deadly clashes, blocking a Palo Blanco tollbooth along a road leading to Acapulco, October 9, 2014. The sign reads, "Aguirre murderer", referring to Guerrero Governor Angel Aguirre. Thousands marched in Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police. The students from the teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains. Mexican President Enrique Pena Nieto vowed on Monday to identify those behind the massacre and make sure they face justice. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Students hold a banner for missing students, which reads Iguala Guerrero, Cuna de Asesinos, (Iguala Guerrero, Cradle of Murderers), during a demonstration demanding their safe return, at a tollbooth for Palo Blanco, to Acapulco, on the outskirts of Chilpancingo, in Guerrero, October 7, 2014. Mexican President Enrique Pena Nieto vowed on Monday to hunt down those responsible for the apparent massacre of dozens of students in the southwest of the country that authorities say involved local security officials. The students went missing after they clashed with police in Iguala in Guerrero on Sept. 26. A mass grave was found near the town over the weekend, full of charred human remains. Guerrero's attorney general, Inaky Blanco, said on Sunday that 28 bodies have been found at the site so far, and it is "probable" that some of the missing 43 students are among the remains found in the graves. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Relatives hold pictures of missing students during a demonstration demanding their safe return, at a tollbooth for Palo Blanco, to Acapulco, on the outskirts of Chilpancingo, in Guerrero, October 7, 2014. Mexican President Enrique Pena Nieto vowed on Monday to hunt down those responsible for the apparent massacre of dozens of students in the southwest of the country that authorities say involved local security officials. The students went missing after they clashed with police in Iguala in Guerrero on Sept. 26. A mass grave was found near the town over the weekend, full of charred human remains. Guerrero's attorney general, Inaky Blanco, said on Sunday that 28 bodies have been found at the site so far, and it is "probable" that some of the missing 43 students are among the remains found in the graves. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Students hold pictures of missing students during a demonstration demanding their safe return, at a tollbooth for Palo Blanco, to Acapulco, on the outskirts of Chilpancingo, in Guerrero, October 7, 2014. Mexican President Enrique Pena Nieto vowed on Monday to hunt down those responsible for the apparent massacre of dozens of students in the southwest of the country that authorities say involved local security officials. The students went missing after they clashed with police in Iguala in Guerrero on Sept. 26. A mass grave was found near the town over the weekend, full of charred human remains. Guerrero's attorney general, Inaky Blanco, said on Sunday that 28 bodies have been found at the site so far, and it is "probable" that some of the missing 43 students are among the remains found in the graves. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

A man holds a picture of a missing student during a demonstration demanding the safe return of those who went missing, at a tollbooth for Palo Blanco, to Acapulco, on the outskirts of Chilpancingo, in Guerrero, October 7, 2014. Mexican President Enrique Pena Nieto vowed on Monday to hunt down those responsible for the apparent massacre of dozens of students in the southwest of the country that authorities say involved local security officials. The students went missing after they clashed with police in Iguala in Guerrero on Sept. 26. A mass grave was found near the town over the weekend, full of charred human remains. Guerrero's attorney general, Inaky Blanco, said on Sunday that 28 bodies have been found at the site so far, and it is "probable" that some of the missing 43 students are among the remains found in the graves. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

A student from Ayotzinapa Teacher Training College student wears a mask as he protests at a tollbooth for Palo Blanco, on the road to Acapulco, to demand the safe return of students who went missing on September 26, on the outskirts of Chilpancingo, in the Mexican state of Guerrero, October 5, 2014. Authorities have found mass graves with the charred remains of up to 20 people in the restive southern Mexican state of Guerrero, at a time when police are scouring the area for nearly four dozen missing students after a rash of violence. According to local media, the state governor said earlier this week that photos showed police had taken some of the students away. Thirteen of an original group of 57 missing people re-emerged this week. Dozens are still unaccounted for. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

A student from Ayotzinapa Teacher Training College student wears a mask during a protest at a tollbooth for Palo Blanco, on the road to Acapulco, to demand the safe return of students who went missing on September 26, on the outskirts of Chilpancingo, in the Mexican state of Guerrero, October 5, 2014. Authorities have found mass graves with the charred remains of up to 20 people in the restive southern Mexican state of Guerrero, at a time when police are scouring the area for nearly four dozen missing students after a rash of violence. According to local media, the state governor said earlier this week that photos showed police had taken some of the students away. Thirteen of an original group of 57 missing people re-emerged this week. Dozens are still unaccounted for. REUTERS/Jorge Dan Lopez (MEXICO)





REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Students from Ayotzinapa Teacher Training College hold a security camera taken from a tollbooth for Palo Blanco, on the road to Acapulco, as they demand for the safe return of students who went missing on September 26, on the outskirts of Chilpancingo, in the Mexican state of Guerrero, October 5, 2014. Authorities have found mass graves with the charred remains of up to 20 people in the restive southern Mexican state of Guerrero, at a time when police are scouring the area for nearly four dozen missing students after a rash of violence. According to local media, the state governor said earlier this week that photos showed police had taken some of the students away. Thirteen of an original group of 57 missing people re-emerged this week. Dozens are still unaccounted for. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

Students from Ayotzinapa Teacher Training College student gather at a tollbooth for Palo Blanco, on the road to Acapulco, to demand the safe return of students who went missing on September 26, on the outskirts of Chilpancingo, in the Mexican state of Guerrero, October 5, 2014. Authorities have found mass graves with the charred remains of up to 20 people in the restive southern Mexican state of Guerrero, at a time when police are scouring the area for nearly four dozen missing students after a rash of violence. According to local media, the state governor said earlier this week that photos showed police had taken some of the students away. Thirteen of an original group of 57 missing people re-emerged this week. Dozens are still unaccounted for. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW)

A worker paints the window of a tollbooth at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS)

Toll collector Marilyn Alvarado (C) waves as she leaves her tollbooth, as the last human toll collector, at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS)

Toll collector Marilyn Alvarado (C) leaves her tollbooth, as the last human toll collector, at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS)

Toll collector Marilyn Alvarado (C) speaks to members of the media from her tollbooth after receiving the last toll at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS MEDIA)

An empty toll booth is seen at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS)

Two bridge workers cover a display at the Golden Gate Bridge toll plaza in preparation of the tolling system conversion in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT)

Toll collector Marilyn Alvarado (C) carries the toll she collected for the last time at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS)

Toll collector Marilyn Alvarado (R) speaks to members of the media from her tollbooth after receiving the last toll at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting today. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to the Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT TPX IMAGES OF THE DAY)

Toll collector Marilyn Alvarado (R) receives the last toll from Jim Eddie (C), who is driving a vintage 1937 Packard, at her tollbooth at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting March 27. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS TPX IMAGES OF THE DAY)

Toll collector Marilyn Alvarado (R) receives the last toll from Jim Eddie, who is driving a vintage 1937 Packard, at her tollbooth at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting March 27. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS)

Toll collector Marilyn Alvarado (R) receives the last toll from Jim Eddie, who is driving a vintage 1937 Packard, at her tollbooth at the Golden Gate Bridge toll plaza in San Francisco, California March 27, 2013. The Golden Gate Bridge will convert from manned tollbooths to a full electronic tolling system starting March 27. With the automated system in place, motorists will have the option of using the existing FasTrak electronic toll collection system or the newly implemented pay-by-plate option, according to Golden Gate Bridge management. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT BUSINESS)

Cars pass through the Golden Gate Bridge Toll Plaza in San Francisco, California, March 26, 2013. The Golden Gate Bridge will change from a manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT)

A sign informing motorists of the upcoming tolling system change is seen at the Golden Gate Bridge toll plaza in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT SOCIETY)

Cars drive across the Golden Gate Bridge in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT SOCIETY)

A car drives past a booth that toll guard Jacquie Dean is manning, at the Golden Gate Bridge toll plaza in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT SOCIETY)

A motorist pays toll to guard Jacquie Dean at the Golden Gate Bridge toll plaza in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT SOCIETY)

Jacquie Dean (R) and her fellow toll guard sit in their booths at the Golden Gate Bridge toll plaza in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT SOCIETY)

Toll collector Jacquie Dean receives cash from a driver at the Golden Gate Bridge toll plaza in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT SOCIETY)

A motorist takes a photo of toll collector Jacquie Dean at the Golden Gate Bridge toll plaza in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT SOCIETY)

Toll collector Jacquie Dean waits for a vehicle at the Golden Gate Bridge toll plaza in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT)

Cars cross the Golden Gate Bridge in San Francisco, California March 26, 2013. The Golden Gate Bridge will change from manned tollbooths to a full electronic tolling system starting March 27, 2013. With the automated system in place, motorists will have the option of using existing FasTrak electronic toll collection system or the newly implemented pay by license plate option. REUTERS/Stephen Lam (UNITED STATES - Tags: TRAVEL TRANSPORT)

Riot policemen begin to form a line as a fire burns behind them at a tollbooth entrance to El Alto December 30, 2010. Bus and truck drivers and powerful citizens groups took to the streets of several Bolivian cities on Thursday to protest a fuel price increase in a challenge to leftist President Evo Morales. REUTERS/Daniel Caballero (BOLIVIA - Tags: POLITICS ENERGY CIVIL UNREST)

An ambulance passes by a tollbooth at which a fire is burning in El Alto December 30, 2010. Protests in Bolivia by bus drivers and neighborhood groups over a fuel price hike gripped several cities on Thursday in a mounting challenge to leftist President Evo Morales. REUTERS/Daniel Caballero (BOLIVIA - Tags: POLITICS ENERGY CIVIL UNREST)

Demonstrators burn a tollbooth on the road to La Paz, in El Alto December 30, 2010. Protests in Bolivia by bus drivers and neighborhood groups over a fuel price hike gripped several cities on Thursday in a mounting challenge to leftist President Evo Morales. REUTERS/Daniel Caballero (BOLIVIA - Tags: POLITICS ENERGY CIVIL UNREST IMAGES OF THE DAY)

Protesting French customs officers distribute leaflets at a tollbooth on the motorway in Schwindratzheim near Strasbourg, April 18, 2002. French custom officers are o strike to demand an increase in their risk allowance to levels recently obtained by French gendarmes and police.

Protesting French customs officers distribute leaflets at a tollbooth
on the motorway in Schwindratzheim near Strasbourg, April 18, 2002.
French custom officers are on strike to demand an increase in their
risk allowance to levels recently obtained by French gendarmes and
police. REUTERS/Vincent Kessler

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