A dynamic road marking system for influencing a flow of traffic has a plurality of road marking units (3, 3′, 3″, . . . ) provided with a light source emitting light in the direction of a driver of a vehicle (6, 6′) traveling over a roadway (10). The road marking unit includes detection apparatus (2) for detecting the intensity of the flow of traffic, and conversion apparatus for converting the detected traffic intensity to a desired traffic intensity with a desired mutual distance between the vehicles (6, 6′) and/or a desired velocity of the vehicles (6, 6′). The road marking system generates a guidance light (1, 1′, . . . ) which seemingly moves along with the flow of traffic by suitably switching on and off the light source in the road marking units (3, 3′, 3″, . . . ). The flow of traffic moves along with the moving guidance light (1, 1′, . . . ). The speed of the guidance light (1, 1′, . . . ) is adapted to the desired mutual distance between the vehicles (6, 6′) and/or to the desired velocity of the vehicles (6, 6′). Preferably, guidance lights (1, 1′, . . . ) are disposed between each of the vehicles. The dynamic road marking system enables higher traffic intensities on roadways and improved traffic safety. In addition, the road marking system including guidance lights (1, 1′, . . . ) facilitates interweaving of vehicles.