Spotsylvania Sheriff Radio IDs

Spotsylvania Sheriff appears to use IDs for mobile radios that contain the vehicle number. For example, vehicle 278 uses a radio ID of 10278. The format appears to be 10xxx, where xxx is the vehicle number. The portable radios are in the format 2xxx, where xxx is the unit ID of the transmitting unit. Therefore, portable radios will always identify the deputy's unit number, but mobile radio IDs will only identify the vehicle (because multiple deputies use the same vehicle at different times).