Question 145 of 180

Why are certain tunnels restricted or prohibited for vehicles carrying specific hazardous materials?

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All tunnels allow every hazardous material without restriction
Tunnel restrictions apply only during rush hour, not overnight
Tunnel restrictions apply only to shipments crossing international borders
An incident inside an enclosed tunnel can be far more dangerous and harder to respond to than one on an open road

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Correct answer to question 145 (Hazardous Materials): An incident inside an enclosed tunnel can be far more dangerous and harder to respond to than one on an open road

Why

An incident like a fire or spill inside an enclosed tunnel is much harder to ventilate, escape, and respond to than one in the open, so certain hazardous materials are restricted or banned from specific tunnels.

Updated: November 2026

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Why are certain tunnels restricted or prohibited for vehicles carrying specific hazardous materials?

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