How to create barrier

Hello! I would like to ask how to do the white part rotation down and The red part is stuck on top of the white part. Sorry for bad english!

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I think I got the first part, you want the white part to rotate down, but I don’t get the 2nd part

They want the white part to rotate downwards while the red one stays horizontal, like a car park barrier which only opens when a ticket is inserted.

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