A method and associated devices are used for updating software of a motor vehicle by transmitting software-updating data via LiFi. A traffic management system includes a plurality of LiFi-enabled transceiver modules and a LiFi-enabled transceiver module of the motor vehicle. During the operation of the motor vehicle in road traffic, the software-updating data of at least one of the LiFi-enabled transceiver modules of the traffic management system are transmitted to the LiFi-enabled transceiver module of the motor vehicle located within a transmission range of the transceiver module.