As you might expect, given the billions America spends on highways, measuring the activity of motorists is practically an industry unto itself.
But data collection on walking and biking is much less rigorous. In most American cities, measuring active transportation consists of recruiting some volunteers to spend a few hours once a year standing at an intersection counting bikes. As a result, very little good data about how many cyclists and pedestrians are out there using the streets and sidewalks is available.
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