14. 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 the stop lines with a reflectorised double continuous line carriageway marking of the size, colour and type shown in diagram 1013.1 in the Regulations. The centre line shall be continued for a distance of 30 metres on each side of the railway measured along the centre of the carriageway from the ends of the double continuous line with a reflectorised double line of the size, colour and type also shown in diagram 1013.1 in the Regulations wherein the continuous line is on the left hand side of the broken line on each approach to the crossing.