Final answer:
Maintain a safe following distance when traveling at 46 to 70 mph on a dry surface.
Step-by-step explanation:
The rule you should use on a dry surface when traveling at 46 to 70 mph is to maintain a safe following distance.
During this speed range, it is important to keep a significant distance between your car and the car in front of you to allow for a proper reaction time and prevent accidents. The recommended following distance is at least three seconds or more.
This means that you should maintain a gap that allows you to count at least three seconds from when the car in front of you passes an object until you pass that same object.