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1 2008

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GNSS technologies for electronic toll collection

Martinez Olague M. A., Cosmen-Schortmann J.

Archives of Transport System Telematics

2008

Vol. 1, iss. 1

68-72

Problems with infrastructure financing, pollution and congestion are leading different countries to the implementation of Road Pricing schemes. GNSS appears as one of the most flexible and cost efficient technologies for the implementation of large ETC systems. However, due to the nature of GNSS with random and occasionally large position errors, GNSS based ETC still has some constraints that need to be overcome. The use of a signal with guaranteed integrity, as the one available in WAAS or EGNOS combined with advanced OBU algorithms provides an efficient solution that guarantees the correctness of the charging. This paper presents the results of the trials in which this technology has been used and demonstrates how the probability of overcharging can be controlled and dramatically reduced in a GNSS-only system. These trials have been executed in London, Madrid and The Netherlands.