Some bridge inspector has the fun of periodically crawling up through the trap door

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Trap doors inside freeway overpasses

Blow the Mission Valley bridge back to Burbank

Matt: While navigating through myriad “seismic retrofit” hazards on area freeways, I've noticed several trap doors on overpasses, with ladders leading inside. I've always assumed overpasses to be solid concrete. I've heard that in Switzerland, ...

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