The report is a theoretical analysis of several communications techniques that will be useful in the full implementation of IVHS technologies. The report is a continuation of the work completed in Part I. It looks at some of the communications problems that have been mentioned as bringing some difficulties to spread spectrum, such as the near-far problem. The report also investigates the simulation protocol that could be used with spread spectrum radio to allow for individualized messages to be sent from traffic management centers to vehicles. The use of infra red as a multi-access communications technique is also investigated. Infra red was chosen since it is the system that is used by Semens in their Lisb and Autoguide systems of vehicle navigation. The third chapter discussed a totally different type of communications. The chapter looks at using radio frequency transponders on vehicles to determine the exact lateral and headway between vehicles. The Path program in California is currently looking at a combination of Radar and magnetic nail in the pavement to accomplish the same result. The method suggested in the report would not require any Radar signals nor devices in the pavement. The RF signals used by the transponders would be well below FCC license requirements.


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