An app to encourage carpooling has been developed in Western Australia by a group of friends frustrated by high CBD car parking fees and public transport costs.

A million more cars are expected to be on WA roads by 2020, and app developer Ben Rattigan said carpooling was an immediate, cheap and obvious way to reduce the volume of traffic during peak periods.

abc.net.au/news/2015-04-10/carpooling-app-developed-in-wa/6385204