Which statement about downhill control and wind effects is supported by the material?

Which statement about downhill control and wind effects is supported by the material?

• A. A set of empty doubles is most affected by strong winds.
• B. A loaded single trailer is most affected by strong winds.
• C. A passenger car is most affected by strong winds.
• D. A forklift is most affected by strong winds.

Answer: (A)

Wind can push on tall, wide configurations, and downhill control is all about managing speed and stability on grades. When a vehicle descends, gusts of wind become a bigger issue, especially for configurations with a large exposed surface area and little weight to resist the push. An empty set of doubles — two trailers with no cargo — presents a large wind-catching surface and minimal inertia, so it’s most easily moved or destabilized by strong winds. A loaded single trailer is heavier and resists wind better, a passenger car sits lower and with less surface area but isn’t comparable to the long, high-profile tractor-trailer setup in this context, and a forklift isn’t a typical highway configuration for downhill wind effects. Therefore, the statement about empty doubles being most affected aligns with how wind and downhill control interact.

Wind can push on tall, wide configurations, and downhill control is all about managing speed and stability on grades. When a vehicle descends, gusts of wind become a bigger issue, especially for configurations with a large exposed surface area and little weight to resist the push. An empty set of doubles — two trailers with no cargo — presents a large wind-catching surface and minimal inertia, so it’s most easily moved or destabilized by strong winds. A loaded single trailer is heavier and resists wind better, a passenger car sits lower and with less surface area but isn’t comparable to the long, high-profile tractor-trailer setup in this context, and a forklift isn’t a typical highway configuration for downhill wind effects. Therefore, the statement about empty doubles being most affected aligns with how wind and downhill control interact.