News Major upgrades set for high traffic Upper Spencer Gulf Highways Hui Jin - 12/05/2023 0 Upgrades to major highways that go through the Upper Spencer Gulf are underway. Picutre, Neralie Bailey. Matt Welch An upgrade of three major highways within the Upper Spencer Gulf will look to improve the safety and reliability of […] Subscribe or Login to see the rest of the content. Username or E-mail Password Remember Me Forgot Password