Method for transmitting data between a vehicle and a traffic security system - wherein a number of possible transmission channels 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 is measured, - wherein a transmission configuration 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, characterised in that - the transmission configuration specifies particular transmission channels for individual data packets (ATS, AOC) associated with a service, - an identifier characterising the transmission configuration 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, - 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, - 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 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 is measured, - wherein a transmission configuration 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, - the transmission configuration specifies particular transmission channels for individual data packets (ATS, AOC) associated with a service, - an identifier characterising the transmission configuration 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, - 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, - 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').