| http://www.w3.org/ns/prov#value | - A method as in claim 21, wherein said step of calculating the distance between said vehicle and each of said base stations is based on the formula: Pr =kPt /dn, wherein Pr equals the received-power of the signal transmitted from the base station, k is a constant, Pt equals the transmitting power of the signal transmitted from the base station, n equals the signal-attenuation factor of the signal t
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