Monday, June 15, 2009

Infrared? Seismic? Inductive loop?

After we encountered this sign on a Greensboro greenway, I've been wondering how trail counters work...the most widely used types turn out to be infrared and seismic, according to a helpful publication of the United States Department of Agriculture titled Trail Traffic Counters Update. Another useful resource is the website for the ITI Remote Trail Traffic Counting System. Because we didn't see any obvious camera, I'm thinking seismic...the type preferred in areas where vandalism is a problem.

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