A Mayor of London and Transport for London advert is seen on a billboard in London, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/Hannah McKay

A government and NHS advert is seen on a billboard in London, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/Hannah McKay

A government and NHS advert is seen on a billboard in London, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/Hannah McKay

A Mayor of London and Transport for London advert is seen on a billboard in London, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/Hannah McKay

A government and NHS Test and Trace advert is seen on a billboard in London, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/Hannah McKay

A government and NHS Test and Trace advert is seen on a billboard in London, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/Hannah McKay

A government and NHS Test and Trace advert is seen on a billboard in London, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/Hannah McKay

Passengers in car cheer as protestors rally against the death in Minneapolis police custody of George Floyd, beneath a billboard with his name on it, in Boston, Massachusetts, U.S., May 31, 2020. Picture taken May 31, 2020. REUTERS/Brian Snyder

A pedestrian light is seen in front of a billboard in Fenton, following the outbreak of the coronavirus disease (COVID-19), Fenton, Stoke-on-Trent, Britain, May 28, 2020. REUTERS/Carl Recine

Times Square billboards display a short video as part of the #DontGoDark campaign staged by a group of companies comprised of chefs, restaurateurs, and other small business owners to communicate a message that the most vulnerable businesses need more support to survive the coronavirus pandemic, during the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York, U.S., May 27, 2020. REUTERS/Caitlin Ochs

People sit in their vehicles while watching Times Square billboards go dark for one minute as part of the #DontGoDark campaign staged by a group of companies comprised of chefs, restaurateurs, and other small business owners to communicate a message that the most vulnerable businesses need more support to survive the coronavirus pandemic, during the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York, U.S., May 27, 2020. REUTERS/Caitlin Ochs

People wait to watch Times Square billboards go dark for one minute as part of the #DontGoDark campaign staged by a group of companies comprised of chefs, restaurateurs, and other small business owners to communicate a message that the most vulnerable businesses need more support to survive the coronavirus pandemic, during the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York, U.S., May 27, 2020. REUTERS/Caitlin Ochs

Times Square billboards display a short video as part of the #DontGoDark campaign, staged by a group of companies comprised of chefs, restaurateurs and other small business owners to communicate a message that the most vulnerable businesses need more support to survive the coronavirus pandemic during the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York, U.S. May 27, 2020. REUTERS/Caitlin Ochs

Times Square billboards go dark for one minute as part of the #DontGoDark campaign staged by a group of companies comprised of chefs, restaurateurs, and other small business owners to communicate a message that the most vulnerable businesses need more support to survive the coronavirus pandemic, during the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York, U.S., May 27, 2020. REUTERS/Caitlin Ochs TPX IMAGES OF THE DAY

Times Square billboards go dark for one minute as part of the #DontGoDark campaign staged by a group of companies comprised of chefs, restaurateurs, and other small business owners to communicate a message that the most vulnerable businesses need more support to survive the coronavirus pandemic, during the outbreak of coronavirus disease (COVID-19) in Manhattan, New York, U.S., May 27, 2020. REUTERS/Caitlin Ochs

A billboard, which is part of a campaign to support medical specialists involved in the fight against the coronavirus disease (COVID-19), is on display in Moscow, Russia May 18, 2020. The billboard (top) reads: "Heroes among us". REUTERS/Maxim Shemetov

A billboard, which is part of a campaign to support medical specialists involved in the fight against the coronavirus disease (COVID-19), is on display in Moscow, Russia May 18, 2020. The billboard (top) reads: "Heroes among us". REUTERS/Maxim Shemetov

A man wearing a face mask walks past billboards of La Rinascente department store, which is due to reopen with social distancing measures applied, after it was closed due to the spread of the coronavirus disease (COVID-19) in Milan, Italy, May 16, 2020. REUTERS/Alessandro Garofalo

A man wearing a face mask walks past billboards of La Rinascente department store, which is due to reopen with social distancing measures applied, after it was closed due to the spread of the coronavirus disease (COVID-19) in Milan, Italy, May 16, 2020. REUTERS/Alessandro Garofalo

People wearing face masks walk past a billboard of La Rinascente department store, which is reopening with social distancing measures applied, after it was closed due to the spread of the coronavirus disease (COVID-19) in Milan, Italy, May 16, 2020. REUTERS/Alessandro Garofalo

A billboard is seen outside the Airbus factory in Broughton, following the outbreak of the coronavirus disease (COVID-19), Britain, May 14, 2020. REUTERS/Phil Noble

Residents walk past a billboard advocating of prevention against the coronavirus disease (COVID-19), before a curfew as a measure to contain its spread, in Nairobi, Kenya May 13, 2020. REUTERS/Thomas Mukoya

Cars drive past the blank billboards on the 6th of October Bridge, amid concerns over the coronavirus disease (COVID-19) in Cairo, Egypt May 13, 2020. REUTERS/Amr Abdallah Dalsh TPX IMAGES OF THE DAY

Cars drive past the blank billboards on the 6th of October Bridge, amid concerns over the coronavirus disease (COVID-19) in Cairo, Egypt May 13, 2020. REUTERS/Amr Abdallah Dalsh

Cars drive past the blank billboards on the 6th of October Bridge, amid concerns over the coronavirus disease (COVID-19) in Cairo, Egypt May 13, 2020. REUTERS/Amr Abdallah Dalsh

A woman, wearing a protective face mask, walks past a billboard, part of a social campaign by a creative agency featuring famous song lines and aimed at easing people's anxieties amid the outbreak of the coronavirus disease (COVID-19), in Sofia, Bulgaria, May 8, 2020. REUTERS/Stoyan Nenov

A woman wearing a face mask cycles past a billboard on a street, following an outbreak of the coronavirus disease (COVID-19), in Beijing, China May 7, 2020. REUTERS/Carlos Garcia Rawlins

A bicyclist rides next to a billboard, a part of a "Mask Fashion Week" during the coronavirus disease (COVID-19) outbreak in Vilnius, Lithuania May 5, 2020. Twenty-one billboards dotted around the UNESCO World Heritage city feature photographs of men, women and children wearing masks as part of a so-called "Mask Fashion Week." REUTERS/Andrius Sytas

People walk on a street next to a billboard, a part of a "Mask Fashion Week" during the coronavirus disease (COVID-19) outbreak in Vilnius, Lithuania May 5, 2020. Twenty-one billboards dotted around the UNESCO World Heritage city feature photographs of men, women and children wearing masks as part of a so-called "Mask Fashion Week." REUTERS/Andrius Sytas

Motorbikes drive past a billboard warning against the coronavirus disease (COVID-19) after the government eased nationwide lockdown during the outbreak in Ho Chi Minh, Vietnam, April 25, 2020. REUTERS/Yen Duong

Apr 24, 2020; Cincinnati, Ohio, USA; A view of a billboard on Expressway Ohio State Route 562 welcoming LSU quarterback Joe Burrow to Cincinnati, after being selected number one overall in the 2020 NFL Draft. Mandatory Credit: Aaron Doster-USA TODAY Sports

Apr 24, 2020; Cincinnati, Ohio, USA; A view of a billboard on Interstate 75 North welcoming LSU quarterback Joe Burrow to Cincinnati, after being selected number one overall in the 2020 NFL Draft. Mandatory Credit: Aaron Doster-USA TODAY Sports

Apr 24, 2020; Cincinnati, Ohio, USA; A view of a billboard on Interstate 71 North welcoming LSU quarterback Joe Burrow to Cincinnati, after being selected number one overall in the 2020 NFL Draft. Mandatory Credit: Aaron Doster-USA TODAY Sports

Apr 24, 2020; Cincinnati, Ohio, USA; A view of a billboard on Interstate 75 North welcoming LSU quarterback Joe Burrow to Cincinnati, after being selected number one overall in the 2020 NFL Draft. Mandatory Credit: Aaron Doster-USA TODAY Sports

Apr 24, 2020; Cincinnati, Ohio, USA; A view of a billboard on Expressway Ohio State Route 562 welcoming LSU quarterback Joe Burrow to Cincinnati, after being selected number one overall in the 2020 NFL Draft. Mandatory Credit: Aaron Doster-USA TODAY Sports

Apr 24, 2020; Cincinnati, Ohio, USA; A view of a billboard on Interstate 71 North welcoming LSU quarterback Joe Burrow to Cincinnati, after being selected number one overall in the 2020 NFL Draft. Mandatory Credit: Aaron Doster-USA TODAY Sports

Apr 24, 2020; Cincinnati, Ohio, USA; A view of a billboard on Expressway Ohio State Route 562 welcoming LSU quarterback Joe Burrow to Cincinnati, after being selected number one overall in the 2020 NFL Draft. Mandatory Credit: Aaron Doster-USA TODAY Sports

People walk under a coronavirus disease (COVID-19) awareness billboard during the outbreak of the coronavirus disease (COVID-19), in Abidjan, Ivory Coast April 21, 2020. The billboard reads: "Let's protect ourselves to protect others". REUTERS/Luc Gnago

A woman wearing a face mask walks near a coronavirus disease (COVID-19) awareness billboard during the outbreak of the coronavirus disease (COVID-19), in Abidjan, Ivory Coast April 21, 2020. The billboard reads: "Let's protect ourselves to protect others". REUTERS/Luc Gnago

People wearing face masks walk under a coronavirus disease (COVID-19) awareness billboard during the outbreak of the coronavirus disease (COVID-19), in Abidjan, Ivory Coast April 21, 2020. The billboard reads: "Together we can avoid the spread of the coronavirus disease (COVID-19)". REUTERS/Luc Gnago

People walk near a coronavirus disease (COVID-19) awareness billboard during the outbreak of the coronavirus disease (COVID-19), in Abidjan, Ivory Coast April 21, 2020. The billboard reads: "Together we can avoid the spread of the coronavirus disease (COVID-19)". REUTERS/Luc Gnago

People wearing face masks walk under a coronavirus disease (COVID-19) awareness billboard during the outbreak of the coronavirus disease (COVID-19), in Abidjan, Ivory Coast April 21, 2020. REUTERS/Luc Gnago

A woman wearing a face mask walks past billboards at the cinema of movies which were released before the lockdown amid the coronavirus disease (COVID-19) outbreak in Ronda, southern Spain, April 20, 2020. REUTERS/Jon Nazca

Madrid's regional government building at Puerta del Sol square is seen reflected off a billboard reading "Thank you! Ultimately, to all of you!", during the lockdown following the coronavirus disease (COVID-19) outbreak in Madrid, Spain, April 19, 2020. REUTERS/Juan Medina

People ride motorbikes near a coronavirus awareness billboard in the rebel-held Idlib city, amid concerns about the spread of the coronavirus disease (COVID-19), Syria April 18, 2020. REUTERS/Khalil Ashawi

People ride motorbikes and drive vehicles near a coronavirus awareness billboard in the rebel-held Idlib city, amid concerns about the spread of the coronavirus disease (COVID-19), Syria April 18, 2020. REUTERS/Khalil Ashawi

An anti-abortion billboard stands in front of a church cemetery along the highway near Chamberlain, South Dakota, U.S., April 16, 2020. REUTERS/Shannon Stapleton

Billboards showing Clap for our Carers in support of the NHS campaign messages are seen in Kensington, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 16, 2020. REUTERS/Hannah McKay

Billboards showing Clap for our Carers in support of the NHS campaign messages are seen in Kensington, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 16, 2020. REUTERS/Hannah McKay

A billboard showing a Clap for our Carers in support of the NHS campaign message is seen in Kensington, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 16, 2020. REUTERS/Hannah McKay

Billboards showing Clap for our Carers in support of the NHS campaign messages are seen in Kensington, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 16, 2020. REUTERS/Hannah McKay

A billboard is seen with a message thanking the NHS in Kensington, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 16, 2020. REUTERS/Hannah McKay

People wearing protective masks walk past a billboard advertising proper hand washing, as the spread of the coronavirus disease (COVID-19) continues, in downtown Miami, Florida, U.S. April 13, 2020. Picture taken April 13, 2020. REUTERS/Marco Bello

A billboard with a message displayed thanking the NHS is seen in London, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 13, 2020. REUTERS/Hannah McKay

A man wearing a protective mask passes by a billboard depicting Chinese President Xi Jinping as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, April 1, 2020. The text on the billboard reads "Thanks, brother Xi". Picture taken April 1, 2020. REUTERS/Djordje Kojadinovic

Cars drive by a billboard depicting Chinese President Xi Jinping as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, April 1, 2020. The text on the billboard reads "Thanks, brother Xi". Picture taken April 1, 2020. REUTERS/Djordje Kojadinovic

A woman passes by a billboard depicting Chinese President Xi Jinping as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, April 1, 2020. The text on the billboard reads "Thanks, brother Xi". Picture taken April 1, 2020. REUTERS/Djordje Kojadinovic

Billboard is seen on a hotel building at Jakarta?s inner ring road which is deserted, during the imposition of large-scale social restrictions by the government to prevent the spread of the coronavirus disease (COVID-19) in Jakarta, Indonesia, April 12, 2020. REUTERS/Willy Kurniawan

Billboard is seen on a hotel building at Jakarta?s inner ring road which is deserted, during the imposition of large-scale social restrictions by the government to prevent the spread of the coronavirus disease (COVID-19) in Jakarta, Indonesia, April 12, 2020. REUTERS/Willy Kurniawan

A person cycles past a billboard with a message in Shoreditch as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 11, 2020. REUTERS/Henry Nicholls