If there is a lot of fog it will affect the social, economic, human life, and particular surrounding highways and airports there are much more dangerous area to driving and flight, the problem has a bad impact on transportation industry. To make matters worse we couldn't observe a thick fog, if there is no piloted weather station. So i commended one way for above the traffic accident by thick fog, that it is LED installation system on the basis of temperature, humidity, illuminance, wind. LED installation system is necessary to prevent avoid big traffic accident at bridge entrance. This is probably the best safeguard against traffic accident owing to a thick fog.