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Communication devices and network techniques are combined in a radio system under development to satisfy safety critical, operational requirements for train location and control in railroad and transit applications. Spread spectrum radios, installed on-board trains, at wayside locations, and at control stations, participate in a synchronous, time slotted network enabling location determination during reliable transfer of control information.

In-Vehicle Safety Advisory and Warning System is a Federal Highway Administration program to develop a nationwide vehicular information system that provides drivers with advance, supplemental notification of dangerous road conditions. The goal is to ameliorate the severity of scenarios which are particularly hazardous and have remained hazardous despite traditional crash reduction techniques such as additional mechanical signing. This system provides additional safety by enhancing the real time interaction between the general driving public and professional agencies. The receptivity to this concept and purchase decision criteria for both groups was investigated using market research interviews.

Intelligent Vehicle Highway System (IVHS) represents the application of information technology to improve the effectiveness of the existing road transportation system resulting in increased safety and better traffic management [1,2]. In-Vehicle Safety Advisory and Warning System (IVSAWS) Program is a Federal Highway Admisistration project to develop a system that provides drivers with advance notification of roadway hazards. IVSAWS units will provide supplemental warnings in order to ameliorate hazardous scenarios (e.g., railroad grade crossings, slow moving vehicles) which are particularly hazardous and have remained hazardous despite traditional crash reduction techniques such as additional mechanical signing. Program aspects include hazard scenario identification, system architecture design, driver alert warning subsystem design, communication subsystem design, and proof of concept field testing.