Baustralian Highway 6A, was a spur road off of Highway 6 connecting it to Concord Palace. It connected to Highway 6 on the west end, breaking at the entrance to Concord Palace, and continues east as Cortland Crescent. It was originally designated Holderton Road 40B from 2018 to 2021, before being redesignated 6A. For a short period in 2022, it was designated Baustralian Highway 31