On an upgrade, passing a truck is often ___ than on a downgrade.
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easier
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riskier
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more difficult
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None of the above.
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Explanation
Passing a vehicle on an upgrade is generally easier than on a downgrade because the truck’s weight and momentum will cause it to slow down on an upgrade. On a downgrade, the truck may gain speed due to the road's inclination. Drivers should always maintain a safe distance from the rear of a truck traveling up a hill, in case it starts to drift back when it begins to move.
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