Don’t try to pass another vehicle if you are within _______ of an obstructed view.

Explanation

According to the Oklahoma Driver's Manual, you must not try to pass if you are within 100 feet of an obstructed view or if vehicles or pedestrians might cross your path. (Note: Even 100 feet is cutting it rather close. Remember that at 40 mph, your vehicle will travel 100 feet in just 1.7 seconds. That's the only safety margin you will have to avoid an accident.)