Light At the End of the Tunnel

by Barbara Chichester

Title

Light At the End of the Tunnel

Artist

Barbara Chichester

Medium

Photograph - Digiart Paintography

Description

FAA Watermark will not appear on purchased artwork...."Light At the End of the Tunnel" Digital Art Photography, by Barbara Chichester...travelling through Northern California, I took this image as we traveled through the Tunnel...

The definition of what constitutes a tunnel can vary widely from source to source. 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 United States, the NFPA definition of a tunnel is "An underground structure with a design length greater than 23 m (75 ft) and a diameter greater than 1,800 millimetres (5.9 ft).
A tunnel is an underground passageway, completely enclosed except for openings for entrance and exit, commonly at each end.....Motor vehicle tunnels usually require ventilation shafts and powered fans to remove toxic exhaust gases during routine operation. Rail tunnels usually require fewer air changes per hour, but still may require forced-air ventilation. Both types of tunnels often have provisions to increase ventilation under emergency conditions, such as a fire. Although there is a risk of increasing the rate of combustion through increased airflow, the primary focus is on providing breathable air to persons trapped in the tunnel, as well as firefighters.

Uploaded

August 9th, 2013

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