Texas A&M recently did a study in
That’s not including the 56 billion pounds of carbon dioxide released into the atmosphere and the 2.9 billion gallons of gas wasted sitting in highway congestion.
The city with the worst traffic is Washington DC, with commuters adding three extra hours to their travel time. That's a lot compared to Pensacola, FL which had the least traffic. People in Pensacola only add nine minutes to their commute.