Which of these does not affect your choice of gears?

• A. Time of day
• B. Grade of incline
• C. Vehicle weight
• D. Road surface

Answer: (A)

Gear selection is driven by the engine load and traction needs, not by the time of day. A steeper incline requires you to stay in a lower gear to supply enough torque and to use engine braking so you don’t lug the engine or stall. A heavier vehicle means more resistance, so you’ll also downshift to keep the engine in its efficient power range and to maintain control and momentum. Road surface affects traction; on slippery or uneven surfaces you downshift earlier to help maintain grip and control and to use engine braking. Time of day doesn’t change the physics of these factors, so it doesn’t influence which gears you should use.