Historical
BS EN 12368:2006
Traffic control equipment. Signal heads (British Standard)
This European Standard only applies to red, yellow and green signal lights for road traffic with 200 mm and 300 mm roundels. It defines the requirements for the visual, structural, environmental performances and testing of signal heads for pedestrian and road traffic use. Portable signal lights are specifically excluded from the scope of this European Standard.
British Standards Institution [bsi]