Image:Sfbaybridge at night.jpg

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[edit] Summary

The illuminations on the cables, while part of the original design, are actually a relatively recent addition, made practical by the availability of high efficiency compact fluorescent lamps.

The original roadway illumination was by low pressure sodium vapor lamps, which while efficient give off a garish monochromatic yellow light. On the lower deck these have been replaced with tubular fluorescent lights attached to the bottom of the upper deck, while on the upper deck the illumination is by high pressure vapor lamps, which give off a more full spectrum light.

This photo is from a newsletter prepared by the Federal Highway Administration of the U.S. Department of Transportation.

http://www.environment.fhwa.dot.gov/strmlng/newsletters/may05nl.asp

[edit] Licensing

Public domain This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.

Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.

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File history

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Date/TimeDimensionsUserComment
current21:09, 21 September 2005345×279 (13 KB)Wolfgang K (San Francisco Bay Bridge)