When cars travel over the "loops," a current is sent to a sensor, and Caltrans and Metro receive updates every 30 seconds. ... Loop detectors are far from new.

The parking garage where I work has an magnetic loop detector for vehicle detection. My mid-sized ‘sport touring’ motorcycle is not small as MCs go, but frequently it is not detected.

The LDD (DIN Rail) and LDP (Plug) series from Carlo Gavazzi are used to control the operation of parking barrier gates based on the inductance of the loop under the pavement. Related To: Carlo Gavazzi ...