A method for operating a roadside network unit is provided, which includes: ascertaining useful data for transmission to at least one further roadside network unit; providing the useful data for transmission on a sidelink channel in a licensed frequency range and/or for transmission on an ad hoc channel in an unlicensed frequency range; and transmitting the useful data on the sidelink channel in the licensed frequency range and/or on the ad hoc channel in the unlicensed frequency range.