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The NOTICE architecture is a new concept in vehicular ad-hoc networking (VANET) that aims at providing automated notification of traffic incidents on highways in order to reduce congestion and improve overall traffic safety. The basic component of NOTICE is a system of sensor belts that collect information from passing cars through a wireless radio link. An indicator of performance for the NOTICE system is the incident detection time which depends on various parameters among which we note the vehicle speed, the time required by communicating radios for connection setup and information exchange, the amount of information to be transmitted, or the radio technology employed. In this paper we present a numerical performance study of the NOTICE system with realistic values of these parameters in an attempt to provide some basic specifications for the physical layer of the system.