The cars have adapted to hit people better though, at least for a given size of car. See Euro NCAP pedestrian test. Cars have softer front ends, and they even pop up on impact to give a softer landing for the pedestrian. Also, automatic emergency braking systems.

Automatic brakes, driver warning systems, better medicine to treat you if you do get hit. Less alcoholism and drunk driving. Radial tires, led headlamps, automatic windshield wipers, daytime running lights, ABS, airbags, hell I think a lot of cars didn't even have seatbelts standard back when some of these were set.

Can't even get 5 more mph on the highway.