The light system is useful when drivers know how to merge (read Perth FAIL). There would most likely be less congestion if they enforced correct merging, keep left and keeping a correct speed.

Yet, this is Perth where there are extended ads saying to "slow down" and imagine everything else bar your driving a deadly weapon.

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[COLOR=Black]Liberty GT Spec B tuned 240 HP & 372 Nm at the hubs.[/COLOR] "Instead of banning high performance cars - ban low performance drivers"