Radar detector responsive to vehicle speed
Radio frequency controlled interrogator-responder system with pa
Radio frequency identification automotive service systems
Radio frequency identification automotive service systems
Radio-communication vehicle identification system
Railroad crossing warning system
Railroad distributed power communication system and method
Railway beacon and related production method
Random signature island circuit
Rangefinder type non-imaging traffic sensor
Reflection multiplier radio wave marker system and traffic...
Remote identification device
Residual charge effect sensor
Residual charge effect traffic sensor
Residual charge-effect traffic sensor
RFID equipped vehicle immobilizer systems including speed...
Road lane recognizing apparatus
Road traffic monitoring system
Road use charging apparatus
Roadway hazard warning system and method