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No it doesn't. Tower Bridge can open to let boats pass under it.
The middle of the bridge opens to let boats pass
Because Tower Bridge is the only bridge to open to allow tallish boats to pass through it.
To allow boats and other vessels to pass through even when their height is greater than the height of the bridge.
a drawbridge looks like a bridge that separates to two parts so boats can pass through.
There isn't another bridge anywhere else in the world that looks anything like Tower Bridge so it is instantly recognisable. It is the only bridge over the river Thames that can be raised to allow tall-masted boats to pass under it. It is still possible for pedestrians to cross the bridge, even when it is 'open' to allow a boat to pass underneath.
Chinook Pass Entrance Arch was created in 1936.
One of the advantages of a draw bridge is lower cost to build. A draw bridge doesn't have the high piers and long approaches of conventional bridges. A disadvantage of a draw bridge is the long wait times as traffic is halted when the bridge is raised for passage.
It is safe to pass only when you are not entering the bridge and there is no oncoming traffic. It you do not have enough time to pass before a bridge wait until after you have crossed the bridge to pass.
Go under the bridge
Agate Pass Bridge was created in 1950.
Marlow By-pass Bridge was created in 1972.