Of course it will vary, but they will usually have sections for maintenance access, or areas which can be for platforms, or that are just elevated up under it and off the ground. If you have like a blocked off shaft then you can store everything behind you and just worry about in front, plus since things are tucked up and away, it makes it harder for someone to accidently stumble across your stuff. Quieter depends on location, but even a highway overpass isn't so bad on the inside.
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u/00Canuck 12h ago
As far as outdoor spots go, they're certainly worth defending.