The $8.9 million project involved widening one kilometre of Armadale Road in both directions by an additional lane. Traffic lights were also installed.
Transport Minister Dean Nalder said the improvements, which began in September, would ease congestion on a road that carries up to 22,000 vehicles a day.
Piara Waters resident Charlie Zerafa has lived on Warton Road for more than a decade and said the improvements were timely.
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READ NOWMr Zerafa, who lives just a few hundred metres from the intersection, said crashes were common. ‘It’s really bad when it banks up so this upgrade was badly needed,’ he said.
‘I would have preferred a roundabout because I think it would have helped keep the traffic flowing a bit better, but we’re still happy with it.
‘Street lights are going up as well so that, again, will help things.’
Jandakot MLA Joe Francis said the intersection had remained dangerous for too long.
‘Armadale and Cockburn Councils have been fighting over responsibility for this upgrade for too long and it’s great to see the State Government has stepped in to just make it happen,’ he said.