An Intelligent Transportation Systems, ITS, device including: a receiver adapted to receive radio signals in at least two frequency bands, wherein a first frequency band is assigned to non-ITS transmissions and a second frequency band is assigned to ITS transmissions and the second frequency band is arranged according to a predetermined access scheme including at least a first logical channel assigned to critical transmissions and a second logical channel assigned to non-critical transmissions, wherein the predetermined access scheme defines time periods for receiving the first logical channel and time periods (424, 426) for receiving the second logical channel; a channel detector arranged to analyse a signal received in the first frequency band to determine the presence of a non-ITS transmission in that frequency band; a transmitter adapted to transmit ITS radio signals in the second frequency band; and a controller configured to: assign the receiver to the first frequency band during at least some periods of the periods (424, 426) the receiver is adapted to receive radio signals on the second logical channel of the second frequency band, and in the event that the channel detector detects a non-ITS signal in the first frequency band during the at least some periods, prevent the transmitter from transmitting a potentially interfering radio signal in the second frequency band during the at least some periods. a receiver adapted to receive radio signals in at least two frequency bands, wherein a first frequency band is assigned to non-ITS transmissions and a second frequency band is assigned to ITS transmissions and the second frequency band is arranged according to a predetermined access scheme including at least a first logical channel assigned to critical transmissions and a second logical channel assigned to non-critical transmissions, wherein the predetermined access scheme defines time periods for receiving the first logical channel and time periods (424, 426) for receiving the second logical channel; a channel detector arranged to analyse a signal received in the first frequency band to determine the presence of a non-ITS transmission in that frequency band; a transmitter adapted to transmit ITS radio signals in the second frequency band; and a controller configured to: assign the receiver to the first frequency band during at least some periods of the periods (424, 426) the receiver is adapted to receive radio signals on the second logical channel of the second frequency band, and in the event that the channel detector detects a non-ITS signal in the first frequency band during the at least some periods, prevent the transmitter from transmitting a potentially interfering radio signal in the second frequency band during the at least some periods. assign the receiver to the first frequency band during at least some periods of the periods (424, 426) the receiver is adapted to receive radio signals on the second logical channel of the second frequency band, and in the event that the channel detector detects a non-ITS signal in the first frequency band during the at least some periods, prevent the transmitter from transmitting a potentially interfering radio signal in the second frequency band during the at least some periods.