15.
(a)The centre line of the carriageway shall be marked on the crossing between the stop lines mentioned in paragraph 12 and for a distance of 12 metres on each side of the railway measured along the centre of the carriageway from stop lines with a reflectorised double continuous line road marking of the size and type shown in Diagram 1013.1A in the Regulations.
(b)The centre line shall be continued for a distance of 36 metres on each side of the railway measured along the centre of the carriageway from the ends of the double continuous line mentioned in paragraph 15a, with a reflectorised double line of the size, colour and type shown in Diagram 1013.1D in the Regulations wherein the continuous line is on the left-hand side of the broken line.
(c)At least one carriageway marking of the size, colour and type shown in Diagram 1014 in the Regulations shall be marked on the carriageway in an appropriate position on the approach side of the road marking described in paragraph 15b.