The Royal Automobile Association (RAA) of South Australia, a non-governmental organisation concerned with motoring-related issues, has proposed a 6km tunnel in Adelaide to ease the current road traffic network.

The proposal from RAA includes a continuous 22km drive on South Road, and a 6km tunnel between Anzac Highway and Croydon as well as the upgradation of Dukes, Princes, Sturt and Barrier Highways, the abcnews website reported.

RAA spokesperson Sharon Hanlon said, “The state will benefit, certainly economically, through improved efficiency and accessibility, but also socially through reduced crash costs and improved road safety and, indeed, even environmentally.”

South Australia’s Transport Minister Patrick Conlon, agreed with the RAA in principal but expressed his concerns about the cost-effectiveness of the proposed solution.