Eight of every 10 motorists who appeal a 'moving traffic violation' fine dished out by Harrow Council win their case.
Independent adjudicator the Parking and Traffic Appeals Service (PTAS) said that in the six months to the end of March 2008, 72 out of 90 appeals succeded.
And in just four instances did the authority opt not to contest the case - meaning the majority of people had to submit evidence to prove their innocence.
The statistics refer to offences where a closed-circuit television camera has caught a driver making a supposedly illegal turn or stopping in a box junction.
Drivers are ordered to pay fines of £120, but these are halved if paid within 14 days.
Hundreds of people make an internal appeal to the council, asking council officers to cancel the fine.
If they are unhappy, drivers then have the option of escalating their appeals to PTAS, the independent adjucator for London, which may resolve cases via postal submissions or, occasionally, an oral hearing.
The figures released by PTAS reveal that when all kinds of penalty charge notices (PCNs) are considered - parking tickets issued when the vehicle is stationary as well as moving traffic violations - 56 per cent of motorists win.
Out of 294 appeals registered during the same sixth-month period between October 2007 and March 2008, 165 were found in the drivers' favour, with Harrow council choosing not to contest matters on eight ocassions.
Councillor Susan Hall (Conservative), portfolie holder for environmental services, said: "The safety of motorists and pedestrians is our priority. We issue PCNs when a traffic offence has been committed; however, due to the increased resources needed to cope with the rise in the number of appeals, we have been investigating each case and taking a decision whether it is necessary to pursue.
"We have now taken steps to provide more of our staff with the training needed to investigate and manage the appeal process. This way, we hope to be able to deal with more appeals successfully in the future without putting a strain on resources."
The council hopes to lessen the number of people appealing by setting up a website, which will put their offences online.
Motorists normally have to ask to see the six pictures a warden takes to document a parking fine.
For 'moving traffic' violations - where a driver has made an illegal turn or stopped in a box junction and is caught automatically on camera - the council sends the PCN in the post with one still of footage of the vehicle making the prohibited maneouvre.
But by the end of the year the council hopes to have a secure online gallery, to which drivers will be able to log on using a reference number and see all the photos.
The council says the idea is to reduce the number of frivolous appeals made to the Parking and Traffic Appeals Service (PTAS).
Harrow council issues 120,000 tickets of all kinds each year and 1,000 people annually contest their PCN at PTAS, at a cost to the council of £100 a time in staff time and processing fees.
Councillor Hall said: "Obviously nobody likes getting a ticket and it is every motorist's entitlement to appeal against a parking notice.
"However, it is in nobody's interest to tie up council time with fruitless appeals just because a driver thinks it is unfair they received a ticket. We hope we can save money by encouraging people to recognise that the vast majority of notices are fairly issued."