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It has been demonstrated by AT&T and others that passive listening devices by the roadside can effectively perform the task of a loopback detector. However, in addition to getting exact counts of vehicles by lane, the acoustic detector can provide additional information such as vehicle speed, vehicle type, and even vehicle maintenance requirements. With a few algorithmic alterations it is possible to significantly lower the cost of these already inexpensive systems. These algorithms allow us to develop a system that uses a PC and a single microphone to accomplish the tasks of a loop-back detector and more.

The Automated Highway System described here is a transponder (or beacon) based system.(1) Much of the Automated Highway System community has taken the approach of making “Smart Cars” with all forms of complex sensors onboard the vehicle. This system has taken all these complex sensors off the vehicle and has only left the actuators and communications necessary to control the vehicle remotely on the vehicle. In addition, this system has eliminated the need for complex roadside sensors by using cooperation between the vehicle and roadside infrastructure.