Mass fog has been reported on Hyderabad- Vijayawada highway. Because of this dense fog, the people behind the wheel in the vehicles have been experiencing fear as it may lead to a chain rear-end accidents resulting in many casualties on the highway. It is difficult to access the effective traffic information when necessary because of the reduction of visibility. This will increase the driver's psychological pressure. In this case, the drivers can not accurately adjust driving behavior and the traffic accidents are likely to happen.