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This paper introduces intelligent headrest using DC motor, photo sensor, and piezo sensor. Intelligent headrest which follows driver''s head during driving can protect driver''s neck efficiently when the vehicle is crashed from rear direction. This paper, we propose an intelligent method of headrest movement. For this method, at first, we had to obtain the optimum information that is the gap between driver''s head and headrest from 10 tested people who included beginner and expert drivers. At second, we developed new control method using this data. As it were, if driver''s head moves forward, headrest has to follow to driver''s head, or else if driver push headrest, headrest has to move backward. For this method, we used photo and piezo sensors. The photo sensor was installed to check the distance between head and headrest, and the piezo sensor was installed to check pressure from driver''s head to headrest.

This paper introduces a speed adaptation system using roadside-to-vehicle RF communication. The RF transmitter transmits transmitter''s ID, speed limit, message to the drivers. The messages include occurrence of accident, freezing road, existence of gas station, or construction on the road, etc. At present, drivers identify the speed limit from speed sign board. But drivers cannot concentrate his attention continuously on finding speed sign board, so over speed takes place unintentionally. And one of current information medium to the drivers is variable message sign board (VMS) showing the present road status such as severe congestion, occurrence of accident, or heavy rain. But due to high installation cost of VMS, insufficient number of VMS units are installed on the road. So timely notification of traffic accident to the following drivers is impossible now. Our system is low cost to be installed at close intervals on the highway.