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The highest fatal traffic accident rate occurs on a curved road at nighttime. The “Active Headlight (AHL)” system developed by Honda R&D and Stanley Electric is the system that the beam pattern of the headlamp changes and more headlamp light is distributed toward a curve direction. The AHL system can direct alighttoward a curve before the vehicle enters a curve by using road information from a navigation system. When the AHL system moved in nighttime, visibility on curves and stability of driving were improved and glare to an oncoming vehicle was acceptable.

LEDs have been developed that are suitable for use in automotive signal lamps. As signal light sources, LEDs have a number of advantages, among which are faster rise times, long life, flexibility in lamp size and shape, and the possibility of unique modes of presentation that may improve signal performance. The purpose of the research described in this paper was to examine driver preferences and response time to unique stop and turn signal presentations using LED sources. The results suggest that subjects preferred some of the signal modes to present-day configurations, and responded faster to them under a variety of conditions.