New traffic signals for Chicago

On February 7th, new traffic signal equipment went into service in the Loop district in Chicago at forty-nine street intersections. All this apparatus, equipped with three-light traffic signals at each corner, is served from underground circuits terminating at the City Hall where a central control board is located. This board provides an extremely flexible control, it being possible to vary the intervals between traffic halts at intersections along the same street. The ratio between periods on intersecting streets may likewise be varied. The control board was built under the specifications of the Department of Gas and Electricity.