Westminster Council will trial the scheme for 12 weeks
Motorists can now park in central London for as little as 20p an hour as part of a new scheme.
Westminster Council is trialling a system where drivers are charged according to how full a car park is when they enter.
Westminster's Queensway car park will operate the scheme for 12 weeks.
The initiative will be extended to all 14 of the authority's car parks, including those in the West End, if the trial is deemed successful.
Councillor Danny Chalkley, from Westminster Council said: "We know that many drivers in London are put off by expensive parking charges.
"Now they will be able to park far more cheaply on a first come, first served basis.
"We have seen the huge success of similar pricing schemes employed by easyJet for their passengers and now hope to emulate this success and provide low cost parking."
Drivers who turn up when the 250-capacity car park is almost full will pay a maximum of £2 per hour - the same as the current maximum hourly rate.