Technical Report Number
Electronic traﬃc signal has the advantage of being easily visible to machines. It is expected to augment the traditional traﬃc light system in future intelligent transportation environments, where intelligent vehicles interact with each other and with traﬃc systems and give informed advisories to drivers. One problem with wireless signals is that they are essentially omnidirectional. Even if one uses directional wireless signaling source, it is not clear how any recipient of a signal can reliably determine whether the signal is meant for him or her, in the presence of signal reﬂections. In this paper, we present a basic electronic trafﬁc signaling protocol framework and two reliable protocols for intersection traﬃc signal and stop sign signal. These protocols enable recipient vehicles to robustly diﬀerentiate the signal’s designated directions despite of potential threats(confusions) caused by reﬂections. We demonstrate how touse one of the protocol to construct a sample application: a red-light alert system. We also address potential inconsistency threats caused by the uncertainty of location system being used and discuss means to handle them.
Huang, Qingfeng and Miller, Ronald, "The Design of Reliable Protocols for Wireless Traffic Signal System" Report Number: WUCSE-2002-45 (2002). All Computer Science and Engineering Research.