Earlier quoted context omitted.
LOL, cars don't go anywhere near 25mph in Boston. They'll average 15mph, if they're lucky. Even with ~70% of the right of way allocated to cars, there's still too many of them for the road to handle. I don't know what "efficiency" you think cars have over other modes but I'm not seeing it on my commute. More often than not, my bike is stuck behind cars (because the bike lane disappeared) rather than they're stuck beh…
15mph is still faster than walking speed. I'm not saying cars are the most optimally efficient mode of transportation, just that they are much more efficient that walking.
In the few places with high 100% walking commutes, I don't see cars being more efficient either. Do you want every college student to drive from their dorm to class? How about poor countries without the money to maintain good road networks?