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| City Traffic, Early 1920s |
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| Baltimore City Policeman with Semaphore, circa 1920 (Courtesy: Kildruffs.com) |
| Gen. Charles D. Gaither Baltimore City Police Commissioner (1920-1937) |
By July 1921, under his direction, the Police Department placed fourteen six feet high "lighthouses" on concrete bases which were intended to warn motorists of dangerous curves and bends at night. The flashing lights in the lighthouses were fueled by acetylene tanks (see photo, below and left) - red flashing indicated places where people had been killed, yellow for dangerous curves or bends where caution must be exercised, and green was for danger at intersections where slow, careful driving should be exercised to the right.
| Acetylene Traffic Beacon |
General Gaither refused to bring "automatic" electric traffic signals to Baltimore City until the Fall of 1925 since he felt that devices on the market prior to then were inefficient in regulating and safeguarding traffic, effectively still in experimental stages. On St. Patrick's Day of 1926, all semaphores at congested intersections between the north-south Gay and Greene streets and east-west Center and Pratt streets were replaced by automatic electric signals, interestingly controlled by one manned traffic tower - all changing at exactly the same time. The Baltimore Sun further reported that thoroughfares like Cathedral and St. Paul streets and Mount Royal, North and Pennsylvania avenues would be operated independently by a traffic tower on each thoroughfare controlling all signals on that street.
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| Native Baltimorean, Charles Adler, Jr. (1899-1980) |
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| Sound-activated Traffic Light - Adler Invention |
While these traffic lights were "automatic" to motorists, they were still controlled by a patrolman located in a tower. True automatic traffic signals were actually invented by a gentleman by the name of Charles Adler, Jr. who was native to Baltimore. An avid inventor, he invented a sound-activated traffic light (see figure, above, right), pavement traffic light sensors, and a list of many other inventions. For all those motorists passing through Baltimore City streets, beware of camera activated ticket lights. Charge those traffic lights like Reddy the Bull and, while you won't meet his similar fate, you will be certain to receive a citation - you just won't have Charles Adler or General Gaither to blame for it.
(Sources: Baltimore Sun Newspaper articles, and Kildruffs.com)






























