Roadside Unit
Roadside Unit (RSU). A Roadside Unit is an Intelligent Transportation System transceiver, operating in the 5895-5925 MHz band, that is mounted along a road or pedestrian passageway. An RSU may also be mounted on a vehicle or is hand carried, but it may only operate when the vehicle or hand-carried unit is stationary. Furthermore, an RSU operating under this part is restricted to the location where it is licensed to operate. However, portable or hand-held RSUs are permitted to operate where they do not interfere with a site-licensed operation. An RSU broadcasts data to or exchanges data with OBUs. For DSRC-based RSUs operating in the Intelligent Transportation System until December 14, 2026, an RSU also provides channel assignments and operating instructions to OBUs in its communications zone, when required.