On 2/1/2015 11:50 AM, Paul C Bernhardt wrote:
The wires do not sense pressure or weight. They sense metal. The presence of metal above the loop changes the magnetic field induced by the loop which changes its electrical properties. Those electrical properties are sensed by the system in the traffic light control box and used to time the changing of the light. Therefore, snow, plows, etc. are unlikely to damage or change their operation. http://en.wikipedia.org/wiki/Induction_loop#Vehicle_detection Paul C Bernhardt Associate Professor of Psychology Frostburg State University pcbernhardtâfrostburg.edu
As a frequent pedestrian, I am often waiting for a car to show up at an intersection so that the light will change.
Ken ------------------------------------------------------------------------ Kenneth M. Steele, Ph. D. steel...@appstate.edu Professor Department of Psychology http://www.psych.appstate.edu Appalachian State University Boone, NC 28608 USA ------------------------------------------------------------------------ --- You are currently subscribed to tips as: arch...@mail-archive.com. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13090.68da6e6e5325aa33287ff385b70df5d5&n=T&l=tips&o=41802 or send a blank email to leave-41802-13090.68da6e6e5325aa33287ff385b70df...@fsulist.frostburg.edu
