The State Government has awarded APN Outdoor a 10-year contract to install and operate the billboards near Hepburn Avenue, Hutton Street and Warwick Road.
A fourth will be erected on the Kwinana Freeway south near Berrigan Drive.
Advertising revenue will be reinvested into traffic and safety improvements and congestion management.
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READ NOWThe billboards are expected to be installed later this year or early next.