What should you do if additional stopping time is necessary due to speed over 40 mph?

Answer: B — Add 1 second

When driving at speeds over 40 mph, your stopping distance increases significantly due to the greater momentum of the vehicle. To ensure safe stopping, it's important to consider the additional time required to bring your vehicle to a halt in case of an emergency or unexpected situation. By adding 1 second to your stopping time, you account for the increased distance your vehicle will cover while you're reacting to a potential hazard. This extra second allows for more time for a driver to assess the situation, apply the brakes, and actually stop the vehicle safely. This principle is especially critical for larger vehicles, such as those driven with a CDL Class A license, as they have significantly longer stopping distances than smaller vehicles. Properly calculating your stopping time can help avoid collisions and improve overall road safety.