A bayside council wants to put a stop to car ownership growth, while doubling its population, by converting hundreds of ordinary parking spots into car share bays.

The City of Port Phillip has released a draft plan for a fourfold increase in car share spots in the next five years, from 79 vehicles to 330 by 2021, in the hope it will encourage thousands of residents to give up their cars.

Craig Lambie is a committed user of Port Phillip's expanding car share service. Credit:Simon O'Dwyer

It estimates each new car share vehicle will remove 10 privately owned cars from the road. Membership of car share schemes has already leapt from 400 in 2011, when there was just 10 bays, to 2500.

The plan, which is out for consultation until April 22, will involve switching existing on and off-street parking to car share bays, further restricting private parking space in a municipality that expects to absorb as many as 100,000 residents in the next 15 years, including up to 80,000 new residents at Fishermans Bend.