Hasluck MHR Ken Wyatt, Forrestfield MLA Nathan Morton and WA Transport Minister Dean Nalder visited the $45 million project, which involved building a bridge over Berkshire Road.
The Federal Government contributed $27.2 million and the State Government the rest.
“This means the risk to motorists has been significantly reduced as well as removing the need to fund and construct further upgrades at the site in years to come,” Mr Morton said.
Mr Wyatt added: “I have been fighting since my election in 2010 to get this black spot fixed and I am delighted to see that it is now open in all directions.
“It is wonderful news for residents of Maida Vale, Forrestfield and High Wycombe who have to use it daily.”
The ‘tennis ball’ design that has been used on Berkshire Road will improve road safety.
It will also help to alleviate congestion for the 40,000 vehicles that travel through the intersection each day.
“This former black spot previously experienced an accident once every 10 days,” Mr Morton said.
Mr Morton advocated for the upgrade since his election three years ago and liaised with the Transport Minister’s office on an almost weekly basis.
Mr Wyatt said the outgoing Deputy Prime Minister and Minister for Transport Warren Truss, who visited the intersection with him on several occasions, had also had a significant input into the completion of the roads.