I wonder if they could develop some kind of universal sensor system that would let cyclists and pedestrians, especially children, carry a chip that causes a warning light to go on at intersections and crosswalks. That way motorists would be attenuated when there was an unseen child/pedestrian/cyclist nearby and exercise more caution. The downside of this might be that more people would get run over when the light or sensors malfunctioned for some reason and motorists just assumed there was no one around without looking.