Explain any two detectors used for traffic counting with respect to Vehicular characteristics.

 Explain any two detectors used for traffic counting with respect to Vehicular characteristics.

Answer: 

       Two detectors used to measure the traffic count with respect to vehicular characteristics

1.Pneumatic road tube counting :   Here every lane is installed with a pair of tubes whose one side is sealed and other side is connected with a data logger. So whenever a vehicle passes over tube air pressure activates inside which helps us to get the vehicle density. Now a days these tubes are equipped with pressure monitoring system by which we can easily get the vehicle characteristics also.

This has for many years been a popular method of vehicle sensing.

 

2. Doppler and RADAR;         

                     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 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.