Recent advances in digital modulation and transmission, signal processing, wireless access protocols, and IC technology have spawned many intelligent devices and objects. A good example are intelligent transportation spaces (ITSP) which have shown many potential benefits including driving safety, transport efficiency, and comfort that accrue from increased traffic information, reduced driving loads, and improved route management. Although wireline communications might enable some ITSP requirements, the inherent mobility, flexibility and scalability of wireless communications clearly make them critical. Enabling technologies in this area include an array of wireless solutions such as ISM bands, DSRC bands, UWB radio, and MAC protocols