Vehicle detection is not based on metal mass
Vehicle detection is based on surface area - the more area the better
Maximum height of detection is 2/3rd the length of the shortest side
Wire running between the loop and the loop detector need to be twisted together
    
Minimum 20 turns per foot
All connections should be Western Union spliced, soldered and taped.
     NO WIRE NUTS OR OTHER ELECTRICAL CONNECTORS
     NO SPLICES