Traffic engineers face "a new conundrum" in dealing with red-light cameras such as this one in New Mexico, according to a recent study looking at how cameras are operated and the perception that they are used to generate revenue. Susan Montoya Bryan/AP hide caption
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How much does noisy traffic in Atlanta affect people's health? David Goldman/AP hide caption
A California Highway Patrol officer surveys the damage after a truck collided with a car on a Los Angeles freeway in February. Shawn Kaye/AP hide caption