(17)Crossings. - (a) At all crossings of track with a road or walkway, danger or crossing signs and wherever reasonably practicable, blinking lights or alarm lights shall be provided. At all important crossings, gates or barriers manned by watchman shall be provided. Swinging gates and barriers shall be secured against inadvertent opening or closing.(b)All crossings, warning signs, gates and barriers shall be illuminated during hours of darkness.