Vehicular ad-hoc network is an emerging class of wireless network that provide efficient communication between vehicles and between vehicles and road side units. VANETs are gaining attention from both industrial and academic point of view due to its applications ranging from safety applications to infotainment applications. The main component for success of VANET applications is its routing. Design of an efficient routing protocol is important for smart Intelligent Transport System (ITS). In this paper, the authors consider how traffic lights affect the design of routing protocol in urban vehicular communication.