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...http://www.google.com.tw/patents/US7147400?utm_source=gb-gplus-share專利 US7147400 - Road marking system
