Reliability of warning light device applications

To increase the safety of the passengers, modern transport system is transforming into an Intelligent Transport System, adopting several components like Road Site Units (RSU) and Warning Light Devices (WLD). The On-board unit in the vehicle will transmit Basic Safety Messages (BSM) periodically to other vehicles and RSUs to prevent collisions and improve traffic flow. WLDs are embedded into road to alert a speeding vehicles by communicating with RSUs. Out of several available short range communication protocol options, it is important to pick the most efficient and reliable one between WLDs and RSUs as they perform critical operations. In this paper, reliability of short range communication protocols such as Bluetooth, ZigBee, Wi-Fi and DSRC are analyzed with respect to the Intelligent Transport System (ITS) infrastructure. Consequently, the reliability of the chosen protocol topologies are evaluated in this paper.