Dedicated Short-range Communications Services (DSRCS). A service providing for data transfer between various mobile and roadside transmitting units for the purposes of improving traffic flow, highway safety and performing other intelligent transportation functions. See §90.7 of this chapter for a more detailed definition.

On-Board Unit (OBU). OBUs are low-power devices on vehicles that transfer data to roadside units in the Dedicated Short-Range Communications Service (see §§90.371-90.383 of this chapter), to improve traffic flow and safety, and for other intelligent transportation system purposes. See §90.7 of this chapter.

Roadside Unit (RSU). See §90.7 of this chapter.