What is a general reason some bridges, in addition to tunnels, carry restrictions for certain hazmat loads?

Pick an answer

1. Bridge restrictions apply only to empty hazmat vehicles
2. Bridge restrictions exist only for oversize loads, not standard placarded trailers
3. Bridges have no meaningful hazmat restrictions in practice
4. An incident on a bridge can be just as hard to manage as one in a tunnel, with limited room to maneuver or evacuate

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