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To give more information, a pilot tunnel (or "drift tunnel") may be driven ahead of the main excavation.

This smaller tunnel is less likely to collapse catastrophically should unexpected conditions be met, and it can be incorporated into the final tunnel or used as a backup or emergency escape passage.

Secret tunnels are built for military purposes, or by civilians for smuggling of weapons, contraband, or people.

Special tunnels, such as wildlife crossings, are built to allow wildlife to cross human-made barriers safely.

For example, the definition of a road tunnel in the United Kingdom is defined as "a subsurface highway structure enclosed for a length of 150 metres (490 ft) or more." In the UK, a pedestrian, cycle or animal tunnel beneath a road or railway is called a subway, while an underground railway system is differently named in different cities, the "Underground" or the "Tube" in London, the "Subway" in Glasgow, and the "Metro" in Newcastle.

The place where a road, railway, canal or watercourse passes under a footpath, cycleway, or another road or railway is most commonly called a bridge or, if passing under a canal, an aqueduct.

Where it is important to stress that it is passing underneath, it may be called an underpass, though the official term when passing under a railway is an underbridge.

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Other key geotechnical factors: For water crossings, a tunnel is generally more costly to construct than a bridge.Rail station platforms may be connected by pedestrian tunnels or footbridges.Much of the early technology of tunneling evolved from mining and military engineering.Some water crossings are a mixture of bridges and tunnels, such as the Denmark to Sweden link and the Chesapeake Bay Bridge-Tunnel in Virginia.There are particular hazards with tunnels, especially from vehicle fires when combustion gases can asphyxiate users, as happened at the Gotthard Road Tunnel in Switzerland in 2001.




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