Signs that indicate a No Passing Zone tell drivers that:

They should speed up and pass the vehicle in front of them.
Passing is encouraged.
They should maintain their current speed.
It is not safe to pass.
Explanation

No Passing Zone signs indicate that it is not safe to pass other vehicles in that specific area. These signs serve as a warning to drivers that passing is prohibited, regardless of whether the road seems clear or not. When you see this sign, you must refrain from attempting to pass vehicles ahead of you in your lane.

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