Activists block a road leading to the venue of International Frankfurt Motorshow (IAA) during a demonstration against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Activists block a road leading to the venue of International Frankfurt Motorshow (IAA) during a demonstration against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

An activist occupies a road sign gate after hanging a banner as a part of a demonstration against climate-damaging cars during the International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Activist occupy a road sign gate after hanging a banner as a part of a demonstration against climate-damaging cars during the International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

An activist plays on a road sign gate after hanging a banner as a part of a demonstration against climate-damaging cars during the International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

An activist occupies a road sign gate after hanging a banner as a part of a demonstration against climate-damaging cars during the International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Protesters sit on a sign during a demonstration against climate-damaging cars outside the venue of International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Protesters sit on a sign during a demonstration against climate-damaging cars outside the venue of International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

An activist hangs a banner on a road sign as a part of a demonstration against climate-damaging cars during the International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Protesters exercise during a demonstration against climate-damaging cars outside the venue of International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Protesters display a placard reading "Driving a car can be deadly" during a demonstration against climate-damaging cars outside the venue of International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

A masked protester stands in front of a banner depicting BMW Vision M NEXT car during a protest against climate-damaging cars outside the venue of International Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

A placard reading "Shut down highways" is displayed as environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Police officers try to remove demonstrators from the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Police officers try to remove demonstrators from the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

A protester has her face painted as environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. The banner reads "Turn back now!" REUTERS/Wolfgang Rattay

A masked protester holds a banner as environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. The banner reads "Turn back now!" REUTERS/Wolfgang Rattay

Environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

Environmentalists block the entrance to the venue of International Frankfurt Motorshow (IAA) as they protest against climate-damaging cars in Frankfurt, Germany, September 15, 2019. REUTERS/Wolfgang Rattay

A car drives past people as they take part in a bicycle demonstration on a highway to protest against climate-damaging cars, as the international Frankfurt Motorshow (IAA) opens for the public, in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

People take part in a bicycle demonstration on a highway to protest against climate-damaging cars, as the international Frankfurt Motorshow (IAA) opens for the public, in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

People take part in a bicycle demonstration on a highway to protest against climate-damaging cars, as the international Frankfurt Motorshow (IAA) opens for the public, in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

People take part in a bicycle demonstration on a highway to protest against climate-damaging cars, as the international Frankfurt Motorshow (IAA) opens for the public, in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

People take part in a bicycle demonstration on a highway to protest against climate-damaging cars, as the international Frankfurt Motorshow (IAA) opens for the public, in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

People take part in a bicycle demonstration on a highway to protest against climate-damaging cars, as the international Frankfurt Motorshow (IAA) opens for the public, in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

Greenpeace activists attend a protests against climate-damaging cars during Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

Greenpeace activists attend a protests against climate-damaging cars during Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

Activists hold placards at a protests against climate-damaging cars during Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

People stand under an inflatable car with a sign reading "Change of traffic - now!" at a protests against climate-damaging cars during Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 14, 2019. REUTERS/Wolfgang Rattay

Climate activists attend a protests against climate-damaging cars during Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 14, 2019. A placard reads "Change of traffic". REUTERS/Wolfgang Rattay

People attend a protest against climate-damaging cars during Frankfurt Motorshow (IAA) in Frankfurt, Germany, September 14, 2019. A placard reads "Change of traffic". REUTERS/Wolfgang Rattay

Motorcycle enthusiasts blow fire through the exhaust of a customised bike on the sidelines of the Indonesia International Motor Show in Jakarta, Indonesia April 23, 2018. Picture taken April 23, 2018. REUTERS/Willy Kurniawan

Visitors view cars on display at the Indonesian International Motor Show in Jakarta, Indonesia, April 20, 2018. REUTERS/Willy Kurniawan

Visitors view cars on display at the Indonesian International Motor Show in Jakarta, Indonesia, April 20, 2018. REUTERS/Willy Kurniawan

A worker cleans the windshield of display cars at the Indonesian International Motor Show in Jakarta, Indonesia, April 20, 2018. REUTERS/Willy Kurniawan

Saudi women are seen at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen TPX IMAGES OF THE DAY

A Saudi woman is seen at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

A Saudi woman checks a car at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

Saudi women are seen at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

A Saudi woman is seen at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

A Saudi woman checks a car at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

Saudi women are seen at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

A Saudi woman is seen at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

A Saudi woman is seen at the first automotive showroom solely dedicated for women in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

A Saudi woman is seen at the first automotive showroom solely dedicated for women, in Jeddah, Saudi Arabia January 11, 2018. REUTERS/Reem Baeshen

A sign " For Sale" is seen during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

People look inside Scania truck during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

A woman looks on Mercedes Actros truck during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

People look on replica of the Batmobile of " Batman" and " Batman Returns" movies during international motorshow in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

People look on replica of the Batmobile of " Batman" and " Batman Returns" movies during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

A logo of Subaru car is seen during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

A logo of Peugeot car is seen during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

A logo of Ford Mustang car is seen during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

A logo of Jaguar car is seen during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

A logo of FIAT car is seen during International Motor Show in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

A boy sits in the Renault Twizy electric car during international motorshow in Riga, Latvia, April 8, 2017. REUTERS/Ints Kalnins

The logo of Renault Samsung is seen during the 2017 Seoul Motor Show in Goyang, South Korea, March 31, 2017. REUTERS/Kim Hong-Ji