Traffic Light Periods
One of the First Traffic Light Signals created.
The above drawing indicates the character and the use of the traffic light which Dr. John Harriss has obtained permission to test. In the first period, vehicular traffic moves north and south. In the second, pedestrian traffic moves in all directions. In the third all traffic waits while pedestrians in the street clear the intersection. In the fourth, pedestrians wait while vehicular traffic moves on the cross street