Gourt > Recreation > Roads and Highways > Bridges and Tunnels (12)
A tunnel is an underground passage. The definition of what constitutes a tunnel is not universally agreed upon. However, in general tunnels have a ratio of the length of the passage to the width of at least 2 to 1. In addition, they should be completely enclosed on all sides, save the openings for the length of the covered area.
A tunnel may be for pedestrians or cyclists, for general road traffic, for motor vehicles only, for rail traffic, or for a canal. Some are aqueducts, constructed purely for carrying water — for consumption, for hydroelectric purposes or as sewers — while others carry other services such as telecommunications cables. There are even tunnels designed as wildlife crossings for European badgers and other endangered species. Some secret tunnels have also been made as a method of entrance or escape from an area, such as the Cu Chi Tunnels).
In the United Kingdom a pedestrian tunnel or other underpass beneath a road is called a subway. This term was also used in the past in the United States, but is now used to refer to underground rapid transit systems.
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Buildings and Bridges :: Technology
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Scientist Worries Over Bridge Lead: Queens Tribune Bridges and Tunnels has a $1 million contract with KTA-Tator eng... http://bit.ly/8sATVx
calamalahoon (Calamalahoon) Thu, 24 Dec 2009 17:31:27 -0000
Scientist Worries Over Bridge Lead: Queens Tribune Bridges and Tunnels has a $1 million contract with KTA-Tator eng... http://bit.ly/8sATVx
So much for a leisurely commute into the city. Buses are standing room only, extra delays on bridges and tunnels.
rcucci (Roger Cucci) Wed, 23 Dec 2009 17:49:47 -0000
So much for a leisurely commute into the city. Buses are standing room only, extra delays on bridges and tunnels.
Jesus Christmas I'm terrified of Bridges and Tunnels
A Span For All Seasons - A collection of photographs of facilities and a large worldwide inventory of suspension bridges.
Bridge of the Month Quiz - An image is posted inviting entrants to identify the feature. A free copy of a book on the subject is awarded to one correct entrant per month.
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Bridgepix.com - Contains photographs and scans of other media of subjects worldwide.
Meta Description: [ Bridgepix is a collection of bridge pictures or images from the following sources: photos or photographs, vintage or old linen postcards, modern chrome postcards and stamps covering all 50 states in USA and some foreign countries. ]
International Peace Highway Project - International Highway Construction Corporation, supporters of a highway system connecting most of the world which would include a Bering Strait bridge and Japan-South Korea tunnel.
MrTunnel.com - Discusses many projects.
Meta Description: [ Home of Mr. Tunnel engineering highway road construction structures transportation design planning ]
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The Bridges Project - Online database of significant bridges compiled by the Department of Civil Engineering at Rice University. Includes photographs.
The Tunnel Page - The longest road and rail tunnels in the world, grouped by categories such as sub-sea tunnels and immersed tubes.
Meta Description: [ The World's longest, widest, highest and deepest canal, road and railway tunnels. Links to historic, current and future projects ]
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