Large trucks are likely to lose speed when:
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Climbing a steep hill.
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Driving behind a passenger car.
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Beginning a downward grade.
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All of the above.
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Explanation
Large trucks often lose speed when climbing steep hills, grades, or mountain roads due to their heavy load. This can make it easier to pass them on an incline. However, the same vehicle may quickly gain speed when going downhill, which could make passing more difficult. Always be alert to how the terrain affects large vehicles. If you're stopped behind a truck on an uphill grade, leave extra space - trucks may roll back slightly when they begin moving. Give them the space they need to operate safely.
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This question appears in the following DMV practice tests:
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