In a no passing zone, the general rule is that passing is not allowed for all vehicles, including cars, trucks, and motorcycles. However, the specific regulations can vary by jurisdiction. Here’s a breakdown of the options you provided:
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Allowed for motorcycles and not allowed for cars and vehicles of normal width and quickness: This is generally not accurate, as no passing zones typically restrict all vehicles from passing.
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Allowed if an obstruction on the right side of the road makes it necessary and only if oncoming traffic is clear: This option may have some validity in certain situations. If there is an obstruction and it is safe to pass (with clear oncoming traffic), some jurisdictions may allow for temporary passing, though it’s advisable to check local laws.
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Allowed if the vehicle in front of you is driving slower than the speed limit: This is generally not allowed in a no passing zone regardless of the speed of the vehicle in front. The no passing zone indicates that passing is prohibited for safety reasons.
In most cases, it is safest and legally required to obey no passing zone signs and refrain from passing altogether, regardless of the type of vehicle. Always refer to local traffic laws for precise regulations.