The road-marking system is described for influencing a flow of traffic consisting of vehicles traveling over a roadway. The road-marking system comprises a plurality of road marking units. The road marking units are provided with at least one light source for emitting light in the direction of a driver of the vehicle In operation, the road-marking system generates a guidance light which seemingly moves along with the flow of traffic and is generated by suitably switching on and off the light source in the road marking units. According to the invention spectral characteristics of the light emitted by the guidance light is dependent on the angle under which the light is emitted, wherein the speed of the guidance light is independent of the flow of the traffic.