Abstract
In the framework of the Dedicated Road Infrastucture for Vehicle Safety in Europa (DRIVE) project results are presented from meteorological research to describe the methods about the forecasting for aquaplaning, bad visibility in fog, rain, snow and hailshowers, and also the decrease in visibility caused by splash and spray water from overtaking vehicles. Methods for forecasting gusts of wind for traffic are presented, just as the expectation for slipperiness in snow or hailshowers and for icy roads. The arising and clearing away from fog under different circumstances, such as changes in temparatures and moisture above water and land is worked out in more detail.