The role of wireless communication in the intelligent transportation systems (ITS) has increased significantly in recent years. The main goal of ITSs is to make roads safer and more efficient by providing information to the drivers and managing authorities [1-3]. Such information may consist of traffic density, accidents, weather conditions and location of vehicles at blind points. The European Union (EU) Directive 2010/40/EU [4] issued in July 2010 defines this term only for the road transportation, which is also adopted in this project. The wide spread deployment of ITSs will achieve a high level of continuous traffic flow, safety, comfort, and a lower carbon foot print.
Vehicular networking is an essential component of ITSs requiring vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) (together referred as V2X) communications to enable vehicles to communicate with each other and with roadside units installed along the road [5]. V2X provides the drivers with a real-time information on traffic and roads conditions including collisions, congestion, surface condition, traffic signal violations, emergency brakes, etc. Such information can be used by the local authorities to develop traffic efficiency applications (e.g., Green Light Optimal Speed Advisory [6], platooning [7]) or by automotive manufacturers to develop safety applications (e.g., collision avoidance [8]). Furthermore, ITSs can assist in-vehicle applications such as internet access, multiplayer gaming and multimedia applications