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.