A package of safety upgrades at key locations along the Dukes Highway has been completed in time for the summer holidays.

Federal Infrastructure and Transport Minister Anthony Albanese said overtaking lanes near Tailem Bend, Ki-Ki, Culburra and Tintinara have been extended, and a rest area two kilometres west of Culburra upgraded.

"All these projects are part of our $100 million Dukes Highway Safety Project, a significant investment designed to improve safety and reduce travel times along this important section of the national road network," Mr. Albanese said.

"In particular, the new, longer lanes will provide safer overtaking opportunities, easing the frustration of motorists and reducing the likelihood they will attempt dangerous passing manoeuvres."

The Dukes Highway Safety Project is a jointly funded initiative, with the Federal Government contributing $80 million and the State Government a further $20 million.

South Australian Transport Minister Patrick Conlon welcomed the completion of work in time for the peak driving season.

"With driver fatigue a major cause of road accidents, the newly upgraded rest area near Culburra is particularly good news. It offers motorists a safe, modern place to pull over and take a much needed break from driving," said Mr Conlon.

"The upgrade involved the construction of new, safer entry and exit points as well as the installation of shelters, tables and solar lighting."

Construction of four new rest areas and the refurbishment of three existing ones are scheduled to get underway within the next six months. A wire rope safety barrier to protect motorists from road side hazards will also be installed at the overtaking lane two kilometres west of Ki-Ki in early 2010.