Traffic can be awful — not just for drivers, but economies and the environment as well. A study released Tuesday by the Texas A&M Institute of Transportation found Cincinnati lost about $947 million in 2011 to delays on the road, coming in at No. 27 nationwide.The Annual Urban Mobility Report also ranked Cincinnati No. 37 nationwide for extra time stuck in traffic, with the average Cincinnati commuter spending an extra 37 hours on the road in 2011. In comparison, the average Columbus commuter spent 40 extra hours in traffic in 2011, and the typical Cleveland commuter spent 31 extra hours. For all three cities, estimates were unchanged from 2010.Traffic jams also have a major impact on climate change. According to the report, congestion caused cars to produce an extra 56 billion pounds of carbon dioxide nationwide, with Cincinnati commuters producing 421 million pounds.The report shows why it’s important for governments to reduce traffic congestion with transit projects like the Cincinnati streetcar. In general, public transportation leads to less congestion by taking cars off the road as people use buses, streetcars and trains instead. But some cities have taken it even further. By adopting exclusive lanes for buses and streetcars, cities like San Francisco have made public transportation more attractive, which makes people more likely to forsake their own cars in favor of public alternatives.