For people living in developed countries the sheer volume of road traffic can be a daily nuisance. The road traffic conditions affect the safety of the population since in Europe around 40,000 people die and more than 1.5 millions are injured every year on the roads. In addition,traffic jams generates huge waste of time and fuel affecting to the economy and increasing the the environmental impacts of surface transportation travel.

Advances in ad hoc wireless technology give rise to the emergence of vehicular ad hoc networks (VANETs). This field deals with the problem of enabling interoperable networked wireless communications among vehicles, the infrastructure, and personal communication devices. Various forms of wireless communications technologies have been proposed for deploying VANETs. WiFi (IEEE 802.11 based) technologies are the most commonly used for deploying VANETs. The vehicles are equipped with wireless network interfaces which use either IEEE 802.11b or IEEE 802.11g standards for access media. However, these are general purpose standards and they do not fit properly the requirements of high dynamic networks such as VANETs. Currently, DSRC (Dedicated Short-Range Communicatio), called also IEEE 802.11p, has been proposed as the communications standard specifically for VANETs

ITS (Intelligent Transportation Systems) rised as the application of the information technologies (communications, sensors, artificial vision, control systems, data storage management, etc.) to the surface transportation.