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Difficulty: Very hardSpecial Zone Signs and Markings

At a highway-rail grade crossing posted with a supplemental EXEMPT plaque beneath the crossbuck sign, drivers of vehicles that normally require mandatory railroad stops—such as school buses and trucks carrying hazardous materials—are still legally required to make a full stop prior to crossing the tracks when no train is approaching.

Answer: Answer

Answer

The statement is False. The EXEMPT plaque at a railroad crossing specifically waives the mandatory stopping requirement for buses and hazardous material transport vehicles when no train is approaching.
The correct evaluation of the statement is False. An EXEMPT plaque placed below a crossbuck sign legally waives the standard requirement for school buses, commercial passenger vehicles, and hazardous material transporters to come to a complete stop before crossing, unless a train is actively approaching.

Step-by-Step Solution

1
Identify the standard rule for specialized vehicles at railroad crossings.
Under general traffic laws, vehicles carrying passengers for hire (such as school buses) and vehicles transporting hazardous materials must stop at all highway-rail grade crossings.
General safety regulations mandate stopping to verify that the tracks are clear before proceeding.
2
Analyze the legal function of the EXEMPT plaque (R15-3P) at special railroad zones.
The EXEMPT plaque is posted by highway authorities (after regulatory approval) to designate tracks that are abandoned, out of service, or infrequently used industrial spurs.
Stopping high-occupancy or hazardous vehicles at such low-risk crossings causes unnecessary traffic congestion and increases rear-end collision hazards.
3
Determine driver duty when the EXEMPT sign is present.
Drivers of mandatory-stop vehicles are legally exempt from stopping unless a train or mechanical signal indicates an approaching train.
The specific regulatory meaning of the EXEMPT sign overrides the general mandatory stopping rule.

Key Concept

Function and legal exemption authority of EXEMPT signs (MUTCD R15-3P) at highway-rail grade crossings
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Topics

Special Zone Signs and Markings

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