Traffic Light revolves around three best friends since college, Mike, Adam, Ethan, who are now in their thirties. Each man finds himself in a different stage of life. Ethan is perpetually single, while Adam just moved in with his girlfriend, and Mike is married and has a son. The series follows the group as they try to balance their friendship with the different demands in each of their romantic relationships. The series is set in Chicago but was filmed in Los Angeles.