Princes Highway at Leawood Gardens above Devils Elbow in 1920. (Transport SA)

Mount Barker Road during Easter 1954. (Highways Department)

Duplication underway on the Princes Highway in 1955. (Highways Department)

Princes Highway (Mount Barker Rd) at Eagle On The Hill in 1956. (Highways Department)

Looking east on Princes Highway at the Glen Osmond Toll House in 1957. (Highways Department)

Single carriageway Princes Highway above Devil's Elbow in 1957. (Highways Department)

Completed dual carriageways above Eagle On The Hill in 1957. (Highways Department)

Construction of a dual carriageway deviation near Eagle On The Hill in 1961. (Highways Department)

Construction of the South Eastern Freeway at Measdays Hill in 1968. (Highways Department)

Construction of the South Eastern Freeway near Arbury Park in 1969. (Highways Department)

South Eastern Freeway at Old Carey Gully Road in 1972. (NAASRA)

Another view of the South Eastern Freeway near Arbury Park, this time in 1973.

Looking west at Crafers from the Old Princes Highway in 1978. (Highways Department)

Swanport Bridge which carries the Princes Highway across the Murray River, bypassing Murray Bridge, in 1987. (NAASRA)

Preparation for the installation of the jersey barrier as an interim measure on Mount Barker Road in 1987. (Highways Department)

Installation of warning signs on Mount Barker Road in 1987. (Highways Department)

Looking west over construction of the Adelaide-Crafers Highway at The Devil's Elbow in 1997. (Transport SA)

View of construction of the Adelaide-Crafers Highway at The Devil's Elbow from high up in the mountains. (Transport SA)

Another view of The Devils Elbow in 1997. (Transport SA)

Westerly view this time of the Devils Elbow. (Transport SA)

Aerial view of the construction at Devils Elbow in 1997. (Transport SA)

Princes Highway closed for rock blasting during construction of the Adelaide-Crafers Highway in 1998. (Transport SA)

Construction of the Mt Osmond Interchange in 1998. (Transport SA)

Mt Osmond Interchange close to completion in 1998. (Transport SA)

Construction of the Heysen Tunnels in 1999. (Transport SA)

The Heysen Tunnels portals in 1999. (Transport SA)

1970s controlled access road sign on Old Princes Highway at Whites Hill Interchange, Murray Bridge. Jan 2005.