| 摘要 |
A control system, having at least one traffic light, for controlling the flow of traffic across a controlled highway. The traffic light has a signal head 10a including a set of lights, a portable FMCW radar detector 30 which monitors a zone in front of the traffic light at a defined range through which the flow of approaching traffic passes. The radar detector generates an output signal that includes information about vehicles identified in the zone of detection, the information including speed and position. A controller receives the output signal from the radar detector and derives a demand signal; the demand may be based on the number of vehicles approaching or stationary at the lights or a model based on historical variations in demand. The controller determines the relative duration of the green to red signal as a function of the demand signal. The system may be battery powered and the FMCW radar may have a duty cycle of less than 20%. |
