Thousands of parking tickets dished out in Birmingham could now be torn up.
And anyone who has already paid their fine should claim their money back, according to the Department of Transport.
The mini-boost for motorists is all because the city council is using the wrong kind of signs.
All blue- backed signs should have been taken down by last December following a DoT ruling.
But in Birmingham many are still up - and wardens are still issuing tickets.
They are mainly used in short stay free parking areas, allowing stays of one to two hours.
Under new regulations the sign should have a large P symbol and a small white sign with parking restrictions on it.
Last year an average 14,312 parking tickets a month were issued in Birmingham and it is estimated 85,000 would have been handed out since the old signs should have been phased out.
It is the latest parking row to hit the city as drivers complain of confusing signs and over-zealous traffic wardens.
Although the city council is unable to estimate how many tickets were issued under the wrong signs, officials have pledged to look into the matter immediately.
A spokeswoman said: "We are working hard to replace plates to meet current requirements, and hope to complete this task in the near future.
"We will review any penalty charge notices possibly issued against blue plates and take appropriate action."