6. The centre line of the carriageway shall be marked on the crossing between the stop lines above and for a distance of 12 metres on the northern side and 10 metres on the southern 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 1013.1A in the Regulations. The centre line shall be continued for a distance of 43 metres on the northern side and 8 metres on the southern 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 shown in diagram 1013.1D in the Regulations wherein the continuous line is on the left hand side of the broken line.