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Many people answer "a drawbridge" to this..... but, technically a drawbridge is either 'raised' or 'lowered'.

However, the famous Tower Bridge in London carries road traffic across the River Thames. But as the photos of it show, the bridge is split in the middle and each side can be raised at an angle to allow ships to pass up and down the river.

So, when Tower Bridge is open to road traffic it is closed to shipping, and when it is closed to road traffic it is open to shippping.

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Wiki User

14y ago
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Wiki User

13y ago

A bag, a bottle, a damper, a door, a drawbridge, a mouth, a purse, a window and a zipper can be opened or closed. There are many more, too.

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Anonymous

Lvl 1
4y ago

Drawbridge

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Q: What is open when it's closed and closed when it's open?
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