South Dakota Operator License Knowledge Practice Test
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Passing target: 80% (24/30)
On the interstate, your car is beside the middle of a tractor-trailer, on its right side. Traffic moves at a steady speed. What should you do?
A travels beside the middle of a tractor-trailer on its right side on an interstate.
Correct answer: Pass it without delay or drop back, so you are not in its blind spot
Why
Trucks and buses have large blind areas, which the manual calls No-Zones, at the front, at the rear, and on both sides. The blind spot on the right side starts behind the cab and can reach the full length of the trailer. Use the mirror test: when you can see the driver's face in the truck's side mirror, the driver has a chance to see you.
Verified against South Dakota Driver License Manual · Large trucks and buses · p. 63, 56
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