Final answer:
At a red light, you should leave the vehicle in drive, not shut down the engine, reverse, or park. This allows for a quick and smooth departure when the light changes. For a smoother stop, easing up on the brake uses kinetic friction transitioning to static friction.
Step-by-step explanation:
When coming to a red light while driving a vehicle with an automatic transmission, the correct action is to: A. leave the vehicle in drive. You should not shut the engine down, put the car's transmission in reverse, or put the car's transmission in park while waiting at a red light. Instead, stay alert and be ready to proceed when the light turns green. Regarding the relationship between static and kinetic friction while driving: When you let up slightly on the brake pedal as you come to a stop, this helps to transition from kinetic friction (which acts when the car is moving and the brakes are applied) to static friction (which holds the car stationary when it is stopped), providing a smoother stop without a shake.
Complete question:
After coming to a red light while driving a vehicle with an automatic transmission, you:
A. leave the vehicle in drive
B. shut the engine down
C. put the car's transmission in reverse
D. put the car's transmission in park