Method for transmitting data between a vehicle and a traffic security system - wherein a number of possible transmission channels (UCH) are available for transmitting data between a vehicle and the traffic security system, - wherein data packets (ATS, AOC) are specified in the vehicle for the transmission to the traffic security system, - wherein the transmission quality of the individual transmission channels (UCH) is measured, - wherein a transmission configuration (UC) is selected from a plurality of previously specified transmission configurations (UC 1 , ..., UC 16 ) from the type of data to be transmitted and the ascertained transmission qualities, according to a specified set of rules (R), characterised in that - the transmission configuration (UC) specifies particular transmission channels (UCH) for individual data packets (ATS, AOC) associated with a service, - an identifier characterising the transmission configuration (UC) is added to the data packets (ATS, AOC), - the data packets (ATS, AOC) specified in the vehicle for transmission are transmitted to the traffic security system together with the identifier in accordance with the transmission configuration (UC), - data packets (ATS', AOC') are specified for the subsequent data transmission between the traffic security system and the vehicle, - for each of the transmission configurations (UC 1 , ..., UC 16 ) in the vehicle, an additional transmission configuration (UC' 1 , ..., UC' 16 ) is available which enables return transmission over the same transmission channel (UCH), - the identifier is identified from the data packet (ATS, AOC) transmitted by the vehicle and the additional transmission configuration (UC') is selected which is associated with the identifier, and - the specified data packets (ATS', AOC') are transmitted from the traffic security system to the vehicle in accordance with the selected additional transmission configuration (UC'). - wherein a number of possible transmission channels (UCH) are available for transmitting data between a vehicle and the traffic security system, - wherein data packets (ATS, AOC) are specified in the vehicle for the transmission to the traffic security system, - wherein the transmission quality of the individual transmission channels (UCH) is measured, - wherein a transmission configuration (UC) is selected from a plurality of previously specified transmission configurations (UC 1 , ..., UC 16 ) from the type of data to be transmitted and the ascertained transmission qualities, according to a specified set of rules (R), - the transmission configuration (UC) specifies particular transmission channels (UCH) for individual data packets (ATS, AOC) associated with a service, - an identifier characterising the transmission configuration (UC) is added to the data packets (ATS, AOC), - the data packets (ATS, AOC) specified in the vehicle for transmission are transmitted to the traffic security system together with the identifier in accordance with the transmission configuration (UC), - data packets (ATS', AOC') are specified for the subsequent data transmission between the traffic security system and the vehicle, - for each of the transmission configurations (UC 1 , ..., UC 16 ) in the vehicle, an additional transmission configuration (UC' 1 , ..., UC' 16 ) is available which enables return transmission over the same transmission channel (UCH), - the identifier is identified from the data packet (ATS, AOC) transmitted by the vehicle and the additional transmission configuration (UC') is selected which is associated with the identifier, and - the specified data packets (ATS', AOC') are transmitted from the traffic security system to the vehicle in accordance with the selected additional transmission configuration (UC'). <EOS>