London's roads are most congested in Europe as average speeds fall to just 10mph
Inrix, which analysed data from almost 950 cities in 37 countries, said that New York was the worst world city for congestion, followed by Mexico City and then London
Inrix, which analysed data from almost 950 cities in 37 countries, said that New York was the worst world city for congestion, followed by Mexico City and then London