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1938 - four types of lighting have been installed by Westinghouse engineers on the 160-mile Pennsylvania Turnpike

MULTI-COLOR LIGHTS KEEP NEW TURNPIKE SAFE

CD 1964094 E&MP27.071

Electric Lighting

1938

Four types of lighting have been installed by Westinghouse engineers on the 160-mile Pennsylvania Turnpike, running from Irwin to Middlesex without highway intersections. Yellow sodium vapor is used at the eleven Interchanges (top) where traffic joins or leaves the road, and at approaches to tunnels; blue-green mercury inside the seven tunnels (center); and white fluorescent inside and incandescent outside ticket houses (bottom). Engineers report the lighting of this high-speed, non-stop, super-highway to be safe and colorful. 


Original Caption by Science Service
Westinghouse



National Museum of American History

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