Basically making people and pets  obstacles  more visible to new autonomous driving cars with adding mini radar reflector beacons similar to the one sail boats have on the top of the mast to be seen by larger ships in bike helmets/ watches/ shoes dog collars etc. The vehicles lidar can pick up the beacon in the helmet and alert the vehicle guidance system. And adding gps from cell phones to navigation system. Also introduce radar reflections signatures for all road and construction barricades and equipment.