  In developing countries, night driving is extremely unsafe mainly due to; 1).
Poorly followed traffic rules and 2) bad road conditions. The number of
accidents is increasing at a frightening pace, necessitating the development of
a low cost automatic headlight control system to ensure safety. In most
accident cases, fatal collisions take place due to glare generated by excessive
headlight intensity (high beam) of the oncoming vehicle. In this paper, a user
friendly controller for headlight intensity control for driving on highway at
night has been proposed. Aim is to design simple and affordable system that can
alleviate effect of blind spot due to high glare on the vehicle windscreen.
Controller is based on Fuzzy inference system (FIS) and used incoming light
intensity as criteria. Also, relative distance and speed is derived using
incoming intensity of the oncoming vehicles. The system is designed considering
human tolerance levels of light intensity as the boundary values. The system
controls headlight beam voltage such that; a) intensity is maintained in human
visual comfort zone and b) blind spot is avoided. The super user feature
incorporated in the intensity controller offers personalized preferences to the
driver. Due to the use of the single parameter (intensity) for control, system
can be implemented using simplified hardware.
