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The world is becoming wireless. In contrast with wired technologies, wireless technologies are widespread in several sectors and they are more and more present in many aspects of life. Wireless includes any technologies which uses no wire. They can be applied for specific applications and have been standardized. (Bluetooth or IEEE 802.15.1, WiFi or IEEE 802.11, ZigBee or IEEE 802.15.4, RFID standardized as ISO 18000, etc). One of the most valuable reasons for the growth of wireless technologies for communications is the requirements for the mobility of modern applications. These requirements, and also security, make wireless technologies one of the best candidates for these applications and for establishing secure communications in traffic vehicular environments, so for vehicle to vehicle (V2V) as well as for vehicle to infrastructure (V2I). Electronic Registration and Identification (ERI) of vehicles is a way to identify a vehicle univocally by means of some kind of wireless technology for communication. This protocol allows a wide range of interesting ITS applications, which involves secure identification of vehicles using symmetrical and asymmetrical techniques. These applications could be applied in private and public services (tolling systems, access to parking lots, information services, etc ). Figure 1 shows a schema which explains the whole architecture in order to understand how ERI standards are settled within an AVI/AEI architecture proposed in ISO 14814. A specific application programming interface of wireless communications developed for Electronic Registration of Vehicles is explained in this chapter as an example of application of this technology. The philosophy of this concept is gathered in the ISO/TS 24534 and ISO/TS 24535 standards, also named ERI standards. This family of standards establishes the architecture of reference to Vehicle Identification independently of the physical technology used, so they do not specify a particular wireless technology to develop any kind of system application (the standard just suggests DSRC technology for deployment of the protocol). In other terms, these standards are linked to the Automatic Vehicle Identification (AVI/AEI) family of standards, which are ISO 14814 to 14816. This family of standards is the framework in which ERI is included. Taking into account what is explained in the standards, ERI protocol allows establishing secure communications between the road infrastructure and the moving vehicles. This is an issue in which several Traffic administrations have been interested in. In this sense,

Low Cost Identification Applications in Traffic Vehicular Environments