road test
road test {n.}
1. A test to see if you can drive a car.
Jim took the road test and got his driver's license last week.
2. A test to see if a car works all right on the road.
Most new cars are given road tests before they are put on the market.
After he repaired the car, the mechanic gave it a road test.
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Source: A Dictionary of American Idioms