self - contained solar - powered long - life intelligent illuminated road markers are provided comprising a one - piece housing formed of optionally colored plastic capable of transmitting light . light is reflected by reflective coating or generated internally by led which is powered by a long life battery , the charging of which is controlled by electrical circuitry which comprises a peripheral interface controller . the electrical circuitry provides intelligent control for a variety of modes corresponding to diverse driving conditions , and can enter a low - power sleep mode to conserve battery life .