Typically, transportation engineers assume that, for most trips, people will forgo traveling on foot for distances that are longer than a quarter- to a half-mile, or by bicycle when they have to travel more than two miles. This is a powerful argument for as much density as possible, in order to maximize the potential number of such trips, but it’s impossible to imagine a transportation future in which every trip (or even most of them) will be short enough to be completed on foot or bike. Whether it’s just for a weekly trip to a supermarket or a daily commute to work, for the foreseeable
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