Basics for Use of Traffic Signal
If you are in Road Traffic Management and you want to know if the traffic signal is needed at a junction or not, you may refer basics from USA Manual on Uniform Traffic Control Devices. Chapter four speaks about basic criteria for installation of Traffic Signal.
https://drive.google.com/file/d/1cGapli9ZIuDcmWE5ilRAZtMCJC2TYzzJ/view?usp=sharing
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