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Question:

In general, the best braking technique to use in maintaining a safe speed when driving on a downgrade is:

A Use the braking effect of the engine to control speed.
Explaination

If a speed limit is posted, or there is a sign indicating \"Maximum Safe Speed,\" never exceed the speed shown. Also, look for and heed warning signs indicating the length and steepness of the grade. You must use the braking effect of the engine as the principal way of controlling your speed on downgrades.