Abstract: A data communication system wherein a network is connected to one polling server and several client stations over a relatively large area. The polling server includes a transceiver connected to the network and is capable of transmitting and receiving a data signal. The client stations are daisy chained in a network connected to said polling server and also provided with a transceiver module connected to the network and they are allowed to broadcast only when accessed by the polling server. A regeneration circuit provides the received data and control signal to its module's transmitter which is in turn presented to the adjacent client station, or vehicular traffic control device. If the module belongs to the first client station in the network, then the data and control signal will be presented to the central location's communications server.