A lack of investment in Perth's rail system has been blamed for new official figures showing Perth is on track to have seven out of Australia's top 10 most congested roads within 15 years.

Two suburbs, Joondalup and Serpentine-Jarrahdale, recorded the longest travelling times in Perth with 50-65 per cent of people spending more than 45 minutes commuting to work every day, according to the Bureau of Infrastructure, Transport and Regional Economics. More than 45 minutes is defined as lengthy by the bureau. Traffic…