The Baltimore region had the 17th worst traffic in the nation in 2012, according to INRIX, a leading provider of traffic data.
The average driver spent 25.7 hours last year locking bumpers with fellow commuters, the sixth annual survey showed. The region did not place a single road in the top 100 for congestion.
Los Angeles led the way, with 51 hours of wasted travel time; Washington was ninth, with 41 hours.
Nationwide, traffic dropped 22 percent in 2012, the second consecutive year of decline, INRIX reported. But the first three months of this year have shown a 4 percent increase.