A yellow diamond sign shows a vehicle on a downward slope. What does it warn?
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A.
A steep grade is ahead Correct
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B.
A runaway-truck ramp is ahead
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C.
A weigh station for trucks is ahead
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D.
Trucks must use the right-hand lane
The answer is "A steep grade is ahead"
The Hill warning sign tells you a steep grade is ahead. On a downgrade you should reduce speed before the descent and use a lower gear if needed. Weigh stations, truck-lane restrictions, and runaway-truck ramps each have their own signs. Treating a yellow warning diamond as a regulatory rectangle that commands lane use is what steers a driver to D.
The traps in the wrong answers
B. A runaway-truck ramp is ahead
Runaway-truck ramps have their own dedicated warning sign. This answer conflates the generic Hill warning with the separate runaway-truck-ramp sign.
C. A weigh station for trucks is ahead
Weigh stations are posted on guide signs, not yellow warning signs. This answer confuses a yellow warning sign with a green or blue guide/information sign.
D. Trucks must use the right-hand lane
Lane restrictions for trucks are regulatory, not warning, signs. This answer treats a yellow warning diamond as a regulatory rectangle that commands lane use.
This question tests your knowledge of Warning Signs in Oregon. Source: Oregon Driver Manual, "Signs & Traffic Signals - Warning Signs," p.12..
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