A system for measuring a magnetic signature of a vehicle, including: at least a first set of sensors (Cxi) that are stationary and arranged along at least a first direction; at least a second set of sensors (Cyj) that are stationary and arranged along at least a second direction that intersects the first...http://www.google.com.au/patents/US7765056?utm_source=gb-gplus-sharePatent US7765056 - Magnetic traffic control system
