The additional CAT service was announced last year as part of the State Government’s $47.6 million plans to ease congestion in the CBD and expand public transport services to cater for a growing population.
The buses will transport commuters from the south western end of the city centre to Leederville and back.
A spokeswoman for Transport Minister Troy Buswell said seven buses had been purchased to run on this route from Monday to Friday between 6am to 7.30pm.
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READ NOWOther plans, including installing CCTV cameras and opening streets to two-way traffic to help ease congestion are also underway.
A Main Roads spokeswoman said 14 new CCTV cameras had been installed in the Perth CBD, with 10 operational.