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Call sign

Signal for obstructed movements in use for existing systems, for the new plants the Progress signal is provided. The call signal consists of two white lamps horizontally matched, fixed under the first-class protection signal to which they refer. The two lamps are normally switched off, when they project two flashing white lights they indicate to the driver that he can overcome the signal disposed by way of impediment or off due to failure; the driver, after stopping at the signal, resumes the movement with sight gear, not exceeding 30 km/h and must in any case stop at the next signal (even if it is disposed to go ahead)

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