How much does it cost to raise Tower Bridge, London?

Every time a ship passes under tower bridge, they raise it, and it's heavy - how much would it cost to raise it each time please?

Answer:
The bridge was designed so that very little effort is required to raise the bridge, yes it is heavy, but each leaf has a commensurate couterweight.

It's like the fact that elevators have counterweights, so that the lift is as nearly balanced as possible, so that as little effort as possible is required to make it move either way.

It may be expensive (or free) to open and close it, however it really has little to do with the weight of the bridge.

Apparently it is free provided if you book in advance and follow proper procedures.

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How much does it cost to raise Tower Bridge, London?

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