Patent ID: 7347643

Claim:
A road stud comprising: a head exposed to the outside from the surface of a road, the head including an outer body exposed to the outside and formed of a transparent material, the cross-section of the outer body being in the form of a half-oval shape, light-emitting diodes arranged in a cross shape inside the outer body to emit red, yellow and blue lights, and a temperature sensor and a humidity sensor arranged in the outer body in such a manner as to be dispersed together with the light-emitting diodes, to measure the temperature and humidity of the road, wherein the outer body has a cross-like groove formed thereon by a predetermined depth, the cross-like groove being configured in a cross shape such that it does not interfere with the light-emitting diodes, the temperature sensor and the humidity sensor; and a part buried in the road, the buried part being in the form of a screw having screw threads, the lower portion of the buried part being tapered, the buried part including a self generator that converts vibration generated when cars run on the road into electric energy and stores electricity, and a control box including a microprocessor, a transmitting/receiving circuit and a signal pre-processor to control the self generator, the light-emitting diodes, the temperature sensor, the humidity sensor and a transmission/reception antenna included therein.