Question

To pass safely you must be able to see clearly how much of a mile of the road ahead

Answer 1

To pass securely, you should have the capacity to see obviously no less than one-third of a mile of the street or road ahead. Whenever a driver's view is hindered by a slope or a bend, they ought to expect that there is an approaching vehicle simply beyond anyone's ability to see. This implies you should just pass if a slope or bend ahead is more than one-third of a mile away.