Paragraph 7
Visual indicators and an audible alarm shall be provided at the control point. The indicators shall show when—
(a)
the main power supply is available;
(b)
all the barriers are fully raised;
(c)
all the barriers are fully lowered;
(d)
at least one of the intermittent red lights in each of the traffic light signals on each side of the railway is showing along the carriageway.