Final answer:
At speeds between 50 to 70 mph, a three-to-four second following interval is generally recommended to maintain a safe driving distance.
Step-by-step explanation:
When traveling 50-70 mph, a three-to-four second following interval is recommended. This safety guideline ensures that a driver has enough time to react if the vehicle in front suddenly stops or slows down. It is important for drivers to maintain a safe distance from the car in front, as this distance provides the necessary time to perceive a hazard, react, and safely bring the vehicle to a stop if needed. Driving instructors often advise new drivers to use the 'three-second rule', which is a basic technique to estimate a safe following distance, regardless of speed. However, as speeds increase, so should the following distance. If conditions are poor, such as during bad weather or heavy traffic, increasing the following interval beyond four seconds is advisable.