We found that, first, the context matters. There's a huge difference between the rural street with no complexity versus all of these 21 design factors that we control for. And when you control for all of these factors, then you see that narrower lanes don't increase...
So we looked at tree coverage, pedestrian furniture, soft sidewalks, number of lanes, street setback, traffic-calming devices in the street - and we even had a variable that would measure the sense of motion in the street. Like how much you have other users of streets like pedestrian and cyclists on the same street sharing space with cars, which again make drivers drive slower and more carefully.
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