13 . If you are following a vehicle that may make frequent stops, such as a bus or delivery truck, you should maintain a minimum following distance of:
16 . Hydroplaning occurs when tires ride on a thin film of water instead of on the surface of the road. To prevent hydroplaning in rainy weather, you should:
Put on your cruise control to maintain a constant speed.
Decrease your speed.
Move to the shoulder of the road as soon as it starts to rain.