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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.
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoDrawbridges helps big boats pass through low bridges. Though this does cause lots of traffic, it helps the boats.
Wiki User
∙ 10y agoA drawbridge allows pedestrians and vehicles to cross on the roadway over the bridge most of the time, but can be pulled up out of the way to allow a ship that is too tall to fit under the bridge to pass on the river underneath the bridge.
Wiki User
∙ 12y agofor ships to go under
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When were the first drawbridges made?
For over 8,000 years ago they have been in use in some form.
Are Drawbridges found on lakes?
Drawbridges are usually found on old castles over the moat.
What materials did the Aztecs build drawbridges with?
The Aztecs didn't build drawbridges. The Europeans did for their castles.
How much do drawbridges cost?
2 dollars
Why are there drawbrige in a castle?
Castles had drawbridges to allow some people inside, usually by providing a bridge to get over a moat or ditch. Drawbridges could be brought up to keep other people out, such as enemies, since they could not get over the moat or ditch without it.
Who used drawbridges in the middle ages?
Castles over a moat.
How do you use hydraulics in bridges?
Hydraulic systems may be used to open and close drawbridges.
What are drawbridges used for?
A drawbridge (bascule bridge) is utilized where the low clearance of a bridge over a waterway would not allow some ships and boats to pass beneath it. This is most commonly seen on active waterways where a bridge is desirable for traffic, but taller/larger ships and boats MUST pass through. Alternatives to drawbridges include vertical lift bridges, where the middle section can be raised high enough to allow ships beneath it, and swing bridges that can pivot in the center. Counter-weighted drawbridges, however, are more common, because they were usually cheaper and easier to construct. In many cities with high vehicular traffic, or for interstate highways, drawbridges have been replaced by modern high-rise bridges.
Are mechanical bridges over navigable waters that raise or turn to allow marine traffic to go under them?
Drawbridges.
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