A modular in-road lighting system is easily installed in the road and is convenient for repair, replacement and maintenance. The lighting system includes at least one modular light, at least one modular cable and a control unit. The top surface of the modular light is flush with a road surface so as to avoid abrasion by passing items. The modular light includes an illumination source and a control circuitry. The illumination source and the control circuitry are configured to emit light in selected direction(s).