When crossing a priority road, you must keep in mind: 1. the width of the priority road, 2. the distance and speed of oncoming traffic, 3. the weather conditions. These are all the influences that are important for crossing the priority road. The weather influences the condition of the road and the visibility. Along with the road width, it determines how long you need to cross the priority road. By estimating the distance and the speed of oncoming traffic you can assess how much time you have available.