If these plans are well received, changes to parking on the red route network could be introduced before the end of the year.
Transport for London (TfL) is consulting Londoners on a Mayoral pledge to increase free parking on some of London's busiest roads from 20 minutes to 30 minutes.
It is hoped the changes, which are in line with the recommendations of Mayor Boris Johnson's Roads Task Force, will help revitalise high streets, provide a boost for small businesses across the Capital and provide more flexibility for people who wish to park and shop, pay a bill or run an errand.
The plans, which are a Mayoral manifesto commitment, would affect around 600 parking bays on TfL's red route network across London.
The consultation will run in 19 London boroughs until 16 September, after which a final decision on implementing the proposals will be made.
The Mayor of London, Boris Johnson, said: 'Parking is a big concern for businesses and retailers in London.
'By extending the length of time that drivers can park at more than 600 locations, we can make it easier for Londoners to shop locally and, crucially, boost trade in our high streets and the economy in the process.'
John Mason, TfL's Director for Traffic Enforcement, said: 'We're confident that these plans will be welcomed by drivers who shop in their local area but need greater flexibility with parking times; and by retailers who will have a captive audience for longer periods of time.
'If these plans are well received, changes to parking on the red route network could be introduced before the end of the year.'
Sue Terpilowski, London Chairman, Federation of Small Businesses, said: 'We welcome plans by Transport for London for red routes in the Capital to permit 30 minutes of free parking.
'The Federation of Small Businesses have long argued that parking charges and availability inhibit local spend and 64 per cent of our members say it has a negative impact on their business.
'This sensible measure will enable more customers to shop locally and enable small businesses to compete with 'free to park' out of town shopping centres.
'We urge councils in London to think about how their parking decisions impact on the local economy, thus, creating parking policies, strategies and an evidence base which is appropriate in the current economic climate.'
The proposal has already been subject to informal consultation with 22 affected London boroughs - of which 19 welcomed the plans.