This is why Seattle lowered our residential street speed limits to 20 mph and many arterials to 25 mph – at 20 mph 9 out of 10 pedestrians who are hit by a vehicle survive; at 30 mph 5 out of 10 survive; at 40 mpg only 1 out of 10 survives.
Vision Zero Seattle has a goal to end traffic deaths & serious injuries on streets by 2030.