A Review Study on Road Safety under Low Visibility and Modern Technology Used To Decrease the Road Accidents

In this study we have expressed the safety risk for low visibility on roadways and tunnel. Stormy or rough weather or smog causes fog/smoke, heavy rain & high winds also affect every visible road by disturbing visibility conditions, driver’s behavior, visibility distance etc. However, they affect traffic safety and traffic flow rate. Visibility is weak for the driver and reduction in visibility due fog or other weather conditions such as heavy rainfall is an advanced factor that affects road accidents. An experimental prospect of visibility and understanding vehicle’s responses, when the visibility falls below the range of driver’s visibility criteria, may be helpful in reducing the chances of accidents under low visibility conditions. According to this, to improve road safety under low visibility conditions it is necessary to improve driver’s mental & physical behavior under such unfavorable conditions. Hence, the objective of this research is to discuss the factors affecting accidents in low visibility conditions, and examine whether the driver depends upon warning messages displayed on the changeable message signs (CMS) and variable speed limit (VSL) signs able to visible during foggy conditions, for roadways; freeways and two-lane roads.