Modern cars whether petrol hybrid or EV all have sophisticated computer systems for enhanced cruise control, lane assist, automatic braking etc. I don't see why cars are not fitted with legal speed restrictors so in built up areas, 20 and 30mph zones in Uk for example, the cars would be automatically restricted to those speeds. They still need extra speed on the open road for overtaking and to get out of trouble, but that's not the case in urban areas. My last speed awareness day - a system for speeding fines in UK where you avoid points on your licence by volunteering to attend a safety day, Ive done 2 so far(!) And actually it was well run, cheerful and yeah I learnt a lot, especially that at under 20mph survivability from a collision with a pedestrian or cyclist is good, but over 30 it quickly becomes life changing or results in death. That and the difference in braking lengths at these speeds, well it was sobering.
So yes restricting motor vehicles in areas with a lot of pedestrians and cyclists, now that a lot of cars can technically do this, seems just sensible.trucks should "gps" restricted only having full power on inclines.