Another Vehicle Loop Detector Circuit 2014-01-12

Many intersections have inductive loops buried in the concrete or asphalt that sense the presence of vehicles and initiate a signal light change. Perhaps you have seen the cutouts in the pavement that have been filled with tar. In the case of an advanced left turn arrow, they may be set back from the intersection by several car lengths. If you know what to look for, you can stop on one of these loops and force the left turn arrow even if you are alone in the lane.

Loops are also used in...

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