FIRST UNDERPASS TO BE LIGHTED BY
CD 1966001 E&MP27.083
August 20, 1938
The State of California Highway Commission has installed the first sodium-vapor lamps to be used for the illumination of an underpass.
The installation is on the Stockton-Sacramento highway about ten miles south of the latter city, and consists of two 10,000-lumen General Electric sodium-vapor lamps in reflectors of the type specially designed by G.E. for sodium-vapor highway lighting units.
It is believed that in addition to the high-efficiency illumination provided by these lamps, the distinctive color of their light will serve as a caution signal to approaching motorists - amber-colored light being widely associated with CAUTION.
Original Caption by Science Service