Roundabout from Virginia

Examples of traffic calming techniques include: landscaped curb bump outs to help reduce traffic speeds and the distance required for a pedestrian to cross a roadway; narrow streets; street islands and marked, signalized crossings to enhance pedestrian safety; street trees; and speed humps. Of course, another non-physical technique to slow down drivers is to set speed limits of 20-25 mph in downtown areas, historic neighborhoods, parks, school zones, and waterfront areas.

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  1. And how much is the diverted traffic to streets with fewer noxious controls measured. Drivers are like water, they will go where the flow is easiest. Some streets in my city have halved the speed but doubled the driver transit time. (ergo those drivers move elsewhere)