Roads Minister Duncan Gay has raised concerns about the way "scarce street parking spaces" are being allocated to car-share schemes.

Car-share schemes such as GoGet, in which users book the use of cars parked locally for private use, have dramatically increased in popularity in recent years, in particular in inner-city Sydney areas.

Richard Poulton, of AFEX, uses GoGet vehicles to get around. Credit:Wolter Peeters

Proponents of the schemes, which include the City of Sydney Council, argue they help free car parking spots by removing the need for nearby residents to own their own cars, or second cars, and park them on the street.

According to figures provided by GoGet, the dominant car-share operator in Sydney, the number of members grew more than 45 per cent between 2013 and 2014, from about 30,000 to 44,000.