The case has been highlighted by Shropshire solicitor Stephen Scully who employed experts to examine the footage of the car as it travelled on the A442 Trench Lock Interchange junction in Telford.
He said the innocent motorist was stunned to receive the ticket, having barely been doing 20mph in the 30mph zone, as he was snapped pulling off from traffic lights.
You can see the speed camera lights flash as the other car overtakes:
It turns out that the motorist, whom Mr Scully referred to as John – not his real name – was overtaken by a car which was speeding.
The speeding car was caught by the camera but the ticket was wrongly issued to John.
The West Mercia Police Camera Ticket Office has said the ticket was down to "human error" when the film was processed.
Mr Scully said: "I was recently asked to represent John. He had received through the post a NIP (Notice of Intended Prosecution) alleging he had been speeding on the A442 Trench Lock Interchange junction.
"As is not uncommon, he was offered a fixed penalty fine and three penalty points on his licence if he accepted the misdemeanour, and consequently he paid up.
However, John, an experienced driver with more than 20 years no claims bonus felt that something was not quite right. He contacted me for advice.
"Fortunately, he had dash-cam footage of the incident.
"I spoke to an expert who generated a brief report confirming what we all suspected – John was innocent and that the vehicle seen overtaking him at speed was the person who should have received the NIP.
"Upon receipt of this evidence, together with a letter from me, the police withdrew the case against John who was obviously delighted."
Mr Scully questioned whether the situation could have affected other motorists or cameras – a suggestion dismissed by the West Mercia Police Camera Ticket Office.
The solicitor said: "John has given me permission to share his story and the dashcam footage, as it is possible other people may have incorrectly been prosecuted for ‘speeding’ at the same junction in Telford and simply paid up as the easier option, when in fact they were innocent.
"It also raises possible questions regarding the calibration of that particular camera and other speed cameras in the West Mercia catchment area."
However, a spokesman for West Mercia Police Camera Ticket Office rejected the suggestion.
He said: "This particular issue was down to a single human error on processing of the film and was rectified as soon as we were notified.
"No other cases are being investigated. All of the calibration certificates for our speed and red light enforcement cameras that have been in place for a minimum of six months can be viewed on our website www.westmercia.police.uk/roadsafety."
Mr Scully said a wrongly-issued ticket could have had serious consequences.
He said: "If it had been someone with nine points who did not have a dash-cam they might have been disqualified and that then lead to people losing their job, their home, a relationship."