Are these companies working on a Waze for self driving cars. Shouldn't these companies, the DMV and other parties involved agree on a standard for inter-car co

Are these companies working on a Waze for self driving cars. Shouldn't these companies, the DMV and other parties involved agree on a standard for inter-car communications? Why should we wait for Lidar to tell my car about a crash 3 turns away, if a shared broadcast/receive system can do it faster?