butako comments

Speed bumps are terrible, the deployment is costly and limited, they cause noise, pollution and annoy drivers. Tokyo has too many narrow streets that are have no pavements and if a road has no pavements I would suggest they are unsuitable for vehicles - narrow streets should be pedestrianized, or make room for pavements.... Physical seperation of car vs pedestrian is a proven safety method.

Frankly though, the answer might already be available - how effective are car automated collision avoidance systems i this scenario? Toyota make this: https://www.youtube.com/watch?v=zAeEnLr3WYk

The government should make this mandatory on all new car sales!

However.. my concern on Automated Collision Avoidence is the moral dillema it puts on the programmer of the robot controller - also known as the Trolley Dilemma - which isn't comfortable to discuss.