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NEMA TS 40001-1989 (R2024)
Traffic Control Systems (Not Recommended for New Designs)
Defines traffic-signaling equipment used to facilitate and expedite the safe movement of vehicular and pedestrian traffic. This Standard has been reaffirmed to make it available for support of legacy traffic-control equipment. For new equipment installations, use TS 2.
NEMA: National Electrical Manufacturers Association [nema]