CHARLES RIVER BRIDGES TO HAVE TRAFFIC LIGHTS SOON

By December 15 Electromatic traffic control signals will be in operation at both ends of the Larz Anderson, River Street, and Western Avenue bridges over the Charles River, according to Captain Chapman of the Metropolitan District Police. These signals will consist of the three-colored automatic lights similar to those now used in Brookline except that they will be controlled by the magnetic disturbance caused by cars passing over metal plates sunk in the pavement. Neither road will have the right of way, but a car passing over the plates will set the lights in its favor if a car on the other artery is not already at the intersection. In periods of dense and slight traffic the signals will change at fixed intervals.