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That depends on the driver's reaction time, the weight of the car, the condition of its brakes,

the condition of the tires, and the material and condition of the pavement.

In the drivers' ed. manual, and often on the written license exam, it's usually recommended

that at 30 miles per hour, you leave 3 car lengths open between your car and the one

in front of you.

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15y ago

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