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When following large vehicles that block your view of the road ahead, give yourself a ____ second or more cushion of space in front of your vehicle.
Failure to stop at a railroad crossing when required to do so can result in a _____ month license suspension.
during the last 100 feet of approaching a railroad crossing, you cannot see the track for at least 400 feet in both directions, you may not cross the tracks at a speed faster than _____ MPH.
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