Go under the bridge
The advantages of a lifting bridge is so big ships can pass through while people cross the bridge.
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A drawbridge. There are different types of draw bridges. A bridge that lifts the roadbed straight up along two towers is called a lift bridge. One that tilts one side or the other using a cantilever system is called a cantilever bridge. A bridge that pivots the span from its center allowing vessels to pass on either side is called a swing bridge. All these bridges are considered draw bridges.
There could be a couple of reasons depending on what weight you are asking about. Some bridges use a counterweight mechanism to raise a section to allow boats under to pass. Some bridges might have a weight under the bridge to tune the frequency response of the bridge in a seismic or wind event.
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.
This riddle is referring to a bridge. Man walks over the bridge, boats pass under it, and during war, bridges are often burned to prevent the enemy from crossing and plundering.
There are several questions that can be asked about bridges. Some of the questions are why do pleasure craft sometimes pass during restricted rush hour periods, can't a city change the hours for lifts, and is there a time of year that the openings of the bridges are heavier than others.
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.
Backstage Pass - 2005 The Bridges was released on: USA: October 2008
Most bridges are not built with boards, and those which are built with boards usually have straight boards, not crooked boards. However, there is a lot of stress placed on bridges by the vehicles that pass over them, and boards could certainly be pushed out of position.
Agate Pass Bridge was created in 1950.
Matanzas Pass Bridge was created in 1927.