28. That length of the northbound carriageway of the M73 from the point where the slip roads from the southbound and northbound carriageways of the M74 merge with the northbound carriageway of the M73 to a point 16 metres or thereby south of where the centreline of the northbound carriageway of the M73 passes over the centreline of the circulatory carriageway of the Baillieston Interchange Roundabout, a distance of 1.9 kilometres or thereby.