 There were several delays in construction of this stretch due to the presence of mine workings that created major difficulties in the stabilisation of the land along the route.The Saddle Hill section was upgraded at this time to a four-lane divided motorway to take advantage of the preparatory earthworks completed in the 1960s.The completion of the Fairfield section meant that SH1 was now an uninterrupted four-lane divided motorway from Lookout Point to the SH87 interchange.