You should NOT pass a vehicle

1. on a curve ✓
2. when the broken line is on your side
3. when a sign warns of a soft shoulder
4. that is slowing down

Answer: A. on a curve

You should not pass a vehicle on a curve.

Why this is the answer

The handbook describes a driver pulling out to pass on a curve as increasing risk. It explains that hazards may be just around the curve, such as an unexpected obstacle that could make the passing driver slow down suddenly, stop, or pull back into your lane. Because you cannot see what is coming, a curve is not a good place to commit to a pass.

Why the other answers are wrong

• B. when the broken line is on your side — The handbook ties passing to whether lane markings permit it; a broken line on your side is not presented as a reason you must not pass.
• C. when a sign warns of a soft shoulder — The passages do not say that a sign warning of a soft shoulder by itself means you must not pass.
• D. that is slowing down — A vehicle slowing down is not listed in the passages as a situation where passing is automatically prohibited; passing still depends on safety and lane markings.

Remember it

Before you pull out to pass, ask whether you can see far enough ahead; a curve hides what is coming.