Doppler Microwave Vehicle Detection

Doppler microwave detection devices transmit a continuous signal of low-energy microwave radiation at a target area and then analyze the reflected signal. The detector registers a change in the frequency of waves occurring when the microwave source and the vehicle are in motion relative to one another. This allows the device to detect moving vehicles.

Radar Microwave Vehicle Detection

Radar is capable of detecting distant objects and determining their position and speed of movement. With vehicle detection, a device directs high frequency radio waves at the roadway to determine the time delay of the return signal, thereby calculating the distance to the detected vehicle.

Weather Dependent

Studies show that radar and doppler microwave sensors provide accurate traffic counts in good weather conditions, however, their accuracy may decrease significantly in adverse weather conditions.1 Other vehicle detectors, using CCTV for example, are more accurate in these conditions.

1Chang, D.K., et al., Use of Hi-resolution data for evaluating accuracy of traffic volume counts collected by microwave sensors, Journal of Traffic and Transportation Engineering (English Edition) (2017),

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