I think that self-driving cars like the ones that Google's company makes can't cope with traffic. Some people thought that some cars like Tesla are self-driving but they are not true self-driving. Those cars require drivers to hold the steering wheels and take over in case of emergencies. Car makers should stop telling people that cars have automatic systems that stop the cars before hitting other cars and people. The cars may not stop automatically before hitting people. People MUST pay attention while driving a car, much like you must pay attention when using large power tools.