METHOD AND APPARATUS FOR DETECTING AND RESPONDING TO AN ABSENCE OF JOURNEY-RELATED INFORMATION

摘要

In a vehicle equipped with a dedicated short-range two-way communications system Fig.2 to acquire and otherwise participate in a roadway information service, method and apparatus are provided to detect 301 an absence of the availability of such a service and to respond by substituting 302 roadway information from other sources and to provide notice 303 to the driver regarding the absence of realtime service information and/or the present use of substituted roadway information.