According to the phenomenon of the disturbances of earth’s magnetic field caused by passing vehicles

anisotropic magnetoresistive sensor using and combining with Zig Bee

a wireless vehicle detector is designed.The principle of vehicle detection is described and an experimental prototype is designed and produced.The results of experiments demonstrate that the wireless vehicle detector can determine the presence of vehicles and their driving directions

and estimate their speed.The wireless vehicle detector has certain accuracy and practicality.