An annual report on Tuesday by the transportation institute at Texas A&M University found Los Angeles to be the worst U.S. city for congestion, based on 2002 federal and state highway data.
The average motorist spent 93 hours sitting in peak-hour traffic in Los Angeles compared with, 67 hours in Washington and 50 hours in New York City.
Traffic delays have more than doubled since the early 1980s as more vehicles have packed an aging highway system in large and fast-growing metropolitan areas.
Motorists wasted 5.7 billion gallons of fuel idling in traffic, the study showed.
The annual financial cost of traffic congestion as measured in wasted fuel and lost productivity is estimated at more than $63 billion, compared to $14 billion two decades ago.
The average cost per motorist was $829 per year, up slightly from 2001.