After a decade of trying to improve traffic, the real-time mapping app Waze has spent the last year trying to get its users to carpool. The app hooks riders up with drivers who are commuting in the same direction, and the riders pay a small fee that goes to the drivers. Waze said it’s gotten about half a million people using the carpool feature, but it’s not an easy sell. Noam Bardin, CEO of Waze, said everyone knows traffic is bad for your health, your life and the environment.