Perth is set for a real taste of gridlock, with warnings of traffic queues of more than 800 metres in morning peak hour for almost a year.

Some CBD traffic bottlenecks are set to get five times worse and could be so choked they face “operational failure,” spilling over into the entire city road network, with traffic set to be “beyond saturation” and rated “F.”

The source of the frustration is imminent early construction works on the Perth Convention and Exhibition Centre, set to kick off in October, forcing the closure of Swan River-hugging Birdiya Drive to allow a tunnel to be built and the centre to be extended towards the foreshore, while other surrounding streets will also be closed and key intersections altered.

City of Perth staff have warned surrounding streets will be so choked,

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