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Question

Difficulty: HardWinter Driving, Snow, and Black Ice

When launching a vehicle from a complete stop on an icy or heavily snow-packed gradient, selecting second gear instead of first gear reduces the mechanical torque delivered to the drive wheels, thereby reducing tire slippage and helping the vehicle establish rolling traction.

Answer: Answer

Answer

True. Starting in second gear on slippery surfaces reduces torque output to the drive wheels, preventing tire spin and allowing tires to gain rolling traction.
Starting in second gear reduces torque to the drive wheels. On icy or snow-covered surfaces with low friction coefficients, lower torque prevents wheels from spinning, allowing the tires to maintain rolling traction.

Step-by-Step Solution

1
Analyze the mechanical relationship between gear selection, torque output, and surface friction.
First gear delivers high mechanical torque to the drive wheels, whereas second gear has a lower transmission ratio and delivers reduced torque.
Understanding gear ratios explains how rotational force is transferred to the tires.
2
Evaluate tire friction limits on icy or snow-packed roads.
Ice and packed snow have extremely low coefficients of static friction. Excess torque easily exceeds this friction limit, causing wheels to spin.
Tire spin transitions the tire contact patch from static friction (rolling traction) to kinetic friction (sliding), severely reducing control and forward force.
3
Determine the safety benefit of launching in second gear.
By reducing wheel torque, second gear keeps the rotational force below the low traction threshold, allowing tires to maintain static rolling traction.
This technique is an established winter driving recommendation in state DMV handbooks for manual and select-shift automatic vehicles.

Key Concept

Traction management and gear selection during winter driving acceleration
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Topics

Winter Driving, Snow, and Black Ice

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