Traffic congestion has been a problem in the United States ever since the 1930s, and since that time, scientists have been studying on the problem.

Debates over the priorities of cars, public transit and "jay walking" are nothing new. There has long been a story class buried within the disagreements.

New apps like EnLighten are trying to help drivers make navigate traffic lights safely with a little help from vehicle-to-infrastructure (V2I) technology.