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Question:

A driver's hand and arm are bent at 90 degrees, pointing downward. This driver intends to

A slow down or stop.
Explaination

Hand-and-arm signals are an alternative if your vehicle's turn signals fail. To signal a right turn, your hand and arm should be bent at 90 degrees, pointing upward. To signal a left turn, your hand and arm should be extended straight out to the left. To signal your intention to slow down or stop, your hand and arm should be bent at 90 degrees, pointing downward.