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A four-lane divided or undivided highway can also be used to practice identifying space gap needs when passing a vehicle on a two-lane roadway.

A driver traveling 40 mph is going to make a flying pass of a vehicle traveling 30 mph. If the driver makes all of the visual checks, signals intentions, and starts the pass from an interval two seconds behind the vehicle ahead, it will take about 13 seconds to complete the pass (at 50 and 40 mph, about 16 seconds, and at 60 and 50 mph, about 19 seconds).

If the passing maneuver is started from three seconds back with both vehicles traveling at the same speed, the passing driver will have to accelerate to a speed 15 mph faster than the vehicle to be passed to complete the pass in the same time limits.

To estimate the time and distance of an oncoming vehicle, begin counting one, 1,000; two, 1,000; etc. When an oncoming vehicle is seen, continue the count until the approaching vehicle is opposite your vehicle. Keep trying until accuracy at estimating necessary passing time is achieved.

Passing is one more situation in which the use of headlights during daylight hours is critical. The combined distance traveled by the passing and oncoming vehicle at 60 mph is 38 seconds, or 3,344 feet. Without headlights on, an approaching vehicle may not become visible until it is within 2,200 to 2,500 feet. This is in contrast to about 4,500 feet with headlights or daytime running lights illuminated. The difference in enhanced visibility can be critical.