Studies show that speeds traveled by motorists are often a principle of design, and not posted speeds. If a motorist feels comfortable driving faster, they will. For example wide, straight, and multi-lane streets (stroads) often produce speeds higher than pedestrian or cycling speeds. Streets that force the motorist to think about the changes ahead of them often force them to drive slower. Think of the difference between highway design and the pre- streets. The safety factor and effective speeds change when design is the primary principle.
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