Tripping loop detectors at automatic gates. This is a well known trick for fire fighters. Often using a ladder to trip the loop detector. The video shows a few objects that work and a few that do not work so we better understand what tools we have availble to us in order to get into a gated area in case of an emergency. The loop detectors are made of wires wrapped in a coil typically 1-6in under the asphalt. It generates a magnetic field and detects the front axle of a vehicle When a vehicle pas