Tunnel

A tunnel is an underground passage. When designed for use by traffic, it may be called an underpass.

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A tunnel may be for pedestrians and/or cyclists, for general road traffic, for motor vehicles only, for rail traffic, or for a canal. Some are 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.

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In the UK a pedestrian tunnel or other underpass beneath a road is called a "subway". This term was also used in the past in the US, but is now used to refer to underground mass transit systems, generally called metros outside the US.

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The central part of a metro or subway network is usually built in tunnels. To allow non-level crossings, some lines are in deeper tunnels than others. At metro stations there are usually also pedestrian tunnels from one platform to another. Often, ground-level railway stations also have one or more pedestrian tunnels under the railway to enable passengers to reach the platforms without having to walk across the tracks.

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Pedestrian: A pedestrian is a person travelling on foot, whether walking or running. In modern times, the term mostly refers to someone walking on a road but this was not the case historically....

Cyclist: A cyclist is a person who engages in cycling whether as a sport (bicycle racing) or who rides a bicycle for recreation or transportation (utility cycling)....

Motor vehicle: A motor vehicle can be:...

Tunnel related Images and Photos (experimental)

Tunnel Vision	Severn Tunnel Flooded	Transatlantic Tunnel (Aka the Tunnel) Richard Dix 1935	Transatlantic Tunnel
Tunnel Red Rocks Park Denver Colorado	The Time Tunnel	Tunnel in Taiwanese Style Garden	Beer Tunnel 1500 Piece Puzzle
Mountain Bridge And Tunnel	Great Northern - Cascade Tunnel Construction 1928	Thomas and Friends Tidmouth Tunnel Playset	Cute Long Hair Guinea Pig In Tunnel Toy