Great Southern Highway

The A4 Great Southern Highway is a large stretch of road that connects Werrington to Castlebrook and Littleroot Town. The NotchRoad officially starts from Dowdell FIelds, just after Colossus Drive, then proceeds via Castlebrook Airport and Castlebrook railway station to Viridian Town.
== Upgrades ==
* Repaving
== Major Exits ==
* Exit 1 - To Tamarama, Glasgow and the City
* Exit 2 - To Silverdale Highway
* Exit 3 - Silverdale Highway
* Exit 4 - Silverdale Highway
* Exit 5 - To Summerley and the Macarthur Highlands
* Exit 6 - Perssons Highway - to Achelous and Arenaville
== Bus Routes ==
CastleBus runs multiple bus routes along the Great Southern Highway.
* 722
* 743
* 744
* 745
* 750
* 751
* 752
* 753
* 754
* 755