Transport distances are measured in units of time. If you have a supersonic helicopter (such a thing doesn't exist and is probably impossible) the distance you can get in a given amount of time is much farther than a slow walk. However in both cases anything more than half an hour away is far away, and anything less is close. The distances are different, but the time is the same.

Sextuple streets are one solution to the problem. Another is not having as far a distance to travel for in the first place. Sextuple streets are extremely expensive - on the order of multi-billions per mile, but they would work. If you sextuple streets only support walkers but not cars they are much cheaper.