Instantly the picture changed from one of discouragement, despair and approaching darkness to animation, excitement, hope. All those loitering in the road leaped back into their vehicles, and in a moment the air was filled with the roar of revving engines as with applause.
What does the phrase "revving engines" bring to mind for the reader?
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It makes us think of cars that are broken
It makes us think of people who are sad
It makes us think of a race about to start