Washington DC has overtaken Los Angeles as the US city with the worst traffic, in annual rankings from Consumer Affairs.

Drivers around the US capital spend more time in traffic than in any other city, with average daily commute times of 33.4 minutes, according to traffic data from the 50 biggest metropolitan areas in the nation.

Washington's average length of weekday congestion - the morning and evening rush hours - is six hours and 35 minutes, second only to Los Angeles, according to the report. That adds up to 71 days' worth of sitting in traffic.

Miami, San Francisco and Atlanta round out the top five cities for worst traffic. Boston, Denver, Portland (Oregon), Chicago and Austin are the best.