You can't predict every hazardous situation down the road, but it's a safe bet you will have to deal with rainy weather. Rain and fog can make it difficult for you to see road signs, obstacles, and other vehicles. On wet roads, you can lose control when wheels spin or lock due to loss of traction.
Freeways are designed to minimize the risk of collisions. They separate traffic, eliminate intersections, and prohibit pedestrians and slower vehicles. Consequently, there are fewer crashes on freeways. However, the high speeds and heavy volume make freeway accidents more severe.