Transport and Traffic Telematics (TTT) - Dedicated Short Range Communication (DSRC) transmission equipment (500 kbit/s / 250 kbit/s) operating in the 5795 MHz to 5815 MHz frequency band - Part 2: Harmonised Standard for access to radio spectrum; Sub-part 1: Road Side Units (RSU) (ETSI EN 300 674-2-1 V3.1.1 (2022-03))