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    • 8. 发明授权
    • Emergency vehicle traffic control system
    • 应急车辆交通管制系统
    • US4228419A
    • 1980-10-14
    • US932264
    • 1978-08-09
    • George P. Anderson
    • George P. Anderson
    • G08G1/087G08G1/07
    • G08G1/087
    • The present system provides a traffic signal control system which will allow moving emergency vehicles to remotely take control of the traffic signals at an intersection. The transmitter part of the system utilizes a microwave transmitter that is mounted on each emergency vehicle, which transmitter emits a pulse coded message which is received by a permanently fixed receiver at each intersection to be controlled. The receiver includes decoding logic to verify that a valid code request has been transmitted by the vehicle. The receiver includes a directional antenna that faces each direction to be controlled which therefore automatically discriminates against signals being received from other directions, and if the appropriate code is received during a predetermined interval of time, the receiver will cause the traffic signals to cycle so that a green or go phase will be directed to the oncoming emergency vehicle and cross traffic will be warned by red signals facing it. After the emergency vehicle has entered the intersection, lack of direct transmission from it will conclude the control after a fixed delay to allow the vehicle time to clear the intersection. The same fixed delay will enable the vehicle to maintain control of the intersection even if it should momentarily lose direct microwave contact because of an intervening large truck or bus.
    • 本系统提供了一种交通信号控制系统,该系统将允许移动的紧急车辆在交叉路口远程控制交通信号。 系统的发射机部分使用安装在每个紧急车辆上的微波发射机,该发射机发射脉冲编码消息,该脉冲编码消息由被控制的每个交叉路口处的永久固定的接收机接收。 接收机包括解码逻辑以验证车辆已发送有效的代码请求。 接收机包括定向天线,其面向要控制的每个方向,因此自动识别从其它方向接收的信号,并且如果在预定的时间间隔期间接收到适当的代码,则接收机将使交通信号循环,使得 一个绿色或进入阶段将被引导到即将到来的应急车辆,交叉路口将被面临的红色信号警告。 紧急车辆进入十字路口后,由于缺少直接传输,在一段固定的延时之后可以结束控制,让车辆时间清除十字路口。 相同的固定延迟将使得车辆能够保持交叉路口的控制,即使由于中间大型卡车或公共汽车,它也应该暂时失去直接的微波接触。