Ealing Council may have illegally issued thousands of pounds worth of parking fines to drivers misled by confusing road markings.
The town hall initially ordered protesting motorists to cough up, claiming it had acted fairly in enforcing a disabled bay which was only partially marked out.
After enquiries from the Gazette, it admitted causing confusion - but said only uncollected fines will be reviewed.
Avis Hemingway says she is one of many drivers caught out and is planning to take her case to a tribunal after the town hall refused her appeal last month.
The 58-year-old bus driver, of Hayes, parked in the bay in Greenford Road before her shift, as it is close to the Greenford bus depot.
She said: "There is one long parking bay with one end marked as a disabled bay. In that section the word 'disabled' is written on the road and there is a sign, but the rest of the bay is blank. It looks like you can park in the rest of the space, enough for two cars, but drivers have been getting tickets.
"It's entrapment - the council must be making a fortune with it. I have a friend who works in the traffic department at another council and she says it's illegal, the disabled bay must be marked off from the rest."
Neighbours said cars were parked in the way when workmen came to paint the lines on the road, so they could not section off the bays properly and have not since corrected the problem.
The town hall say 31 fines have been issued in the bay since it was created in June. With fines of either £50 or £120 - depending on how quickly they are paid - the council could have cost motorists up to £3,720.
A council spokeswoman said: "We understand this particular bay has caused some confusion to motorists and we've carried out a site visit to assess the issues raised.
"We accept that it could be unclear to some residents and will be reviewing the outstanding fines from this location. We've also contacted the resident, who we installed the disabled bays for, to discuss her requirements and we have now remarked the bay."