 Further evidence of the Ministry of Works intentions can be seen on the "flood-free" section of SH1 near Henley on the Taieri Plains, 35 km south of Dunedin, where the two-lane road has a 2.5-metre shoulder on the northbound side and a standard 0.5-metre shoulder on the southbound.This two-lane road was constructed in the early 1970s as the northbound lanes of a motorway, with the intention that separate southbound lanes would be constructed in the future.The motorway was constructed in a number of sections.