The world's leading traffic information service (INRIX) has ranked the most congested cities in 2021: 1/ London (United Kingdom) 2/ Paris (France) 3/ Brussels (Belgium) 4/ Moscow (Russia) 5/ New York City (USA) 6/ Chicago (USA) 7/ Rome (Italy) 8/ Bogota (Colombia) 9/ Palermo (Italy) 10/ Istanbul (Turkey) London, Paris and Brussels drivers lost respectively on average 148, 140 and 134 hours in traffic jams in one year.