'Trackless trams' tipped to save emissions and budgets

An urban planner says trackless trams are more cost effective than light rail used in many cities. (Dan Himbrechts/AAP PHOTOS)

Australian cities are being urged to consider adopting "trackless tram" technology to cut emissions, reduce traffic and help household budgets. 

Prominent urban planner Mike Day issued the recommendation after Perth became one of the first cities to trial the low-emission technology that required as little as "one fifth" the investment of a traditional tram.