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Coloured lights give the indications at night. The semaphore mechanism is equipped with lenses illuminated by a lamp, so that a red light shows when the semaphore is in the “stop” position, a green light – when the semaphore is in the “proceed” position, and a yellow light – when the semaphore is in the restrictive position. The colour-light signal sometimes used is known to have semaphore arm and give both day and night indications be means of red, green and yellow lights. We know some signals to be operated by hand, others to be automatic.