Gungahlin Drive Extension (GDE) is a motorway grade road, located in the Belconnen district of Canberra, Australia. It is 8.3 kilometres long and extended the previously existing Gungahlin Drive from the Barton Highway in the district of Gungahlin to the Glenloch Interchange to connect with the Tuggeranong Parkway, Parkes Way, and William Hovell Drive. Early in the planning stages, the GDE was to instead be designated the John Dedman Parkway.

Barton Highway is a highway in New South Wales and the Australian Capital Territory. It connects Canberra to Hume Highway at Yass, and it is part of the route from Melbourne to Canberra. It is named in honour of Sir Edmund Barton, the first Prime Minister of Australia.