A Ferrari driver who challenged a £100 fine by claiming the speed limit signs were obscured by traffic has now been ordered to pay £874.
Stuart Shield, 63, was driving his bright yellow Ferrari 458 northbound along the A1 at 8.15am last June.
He was caught doing 57mph in a 50mph zone through roadworks near Grantham.
The 50mph zone followed a series of average speed cameras along a two-to-three mile section which has a speed limit of 70mph.
Shield denied speeding and represented himself at Lincoln Magistrates' Court on Thursday, LincolnshireLive reports.
He told the court he accepted he was doing 57mph but argued the road signs were inadequate.
The magistrates did not buy it and he was found guilty.
Shield was fined £220, given three points on his licence, and ordered to pay £620 court costs and a £34 victims of crime surcharge.
Shield, a publisher who runs International Property Awards which last year had a £2.5m turnover, told the court that believed he was travelling at 57 mph, and that neither his speed nor the camera were faulty.
He said: "What I'm questioning is the ease for very heavy traffic on the A1 to obscure views of the signs.
Sign up for our daily newsletter to keep up to date with all the essential information at www.mirror.co.uk/email .
"If you cannot see the signs, you cannot obey the signs."
Shield submitted a Freedom of Information Act request which showed he was among 9,091 people caught speeding at the same location in June 2020, which he claimed it meant it was Britain's most profitable speed camera.
He told the court this was a "jawdroppingly massive amount".
Shield said: "This was the first time I had gone along this section of the A1 for quite some considerable time.
"I had to investigate for my own mind, to see if I was losing my ability to drive safely due to my age."
He discovered that 8,999 of the drivers caught were travelling at between over 50mph and 70mph and 92 were going faster than 70mph.
Shield added that the number of drivers caught at the same spot in June this year had reduced to 2,378, of which 2,347 were doing over 50mph to 70mph, with 31 going faster than 70mph.
Shield told the court he drove along the same stretch of road at the beginning of the year and added: "You get a wall of lorries and you cannot see any signs.
"It's all about signage. Without seeing the signs, no-one knows they are speeding."
The court heard evidence from HW Martin (Traffic Management) Ltd that there are nine warning signs before the speed camera, and that they are in place to protect workers on-site and to "ensure they are visible to all motorists to ensure maximum compliance".
Chairman of the bench John Hoyle told Shield: "You have accepted in evidence that you were travelling at 57mph at that time on that stretch of road.
"We are not persuaded that the signage was inadequate, therefore we find you guilty."
Speaking after the hearing, Shield, who lives in Essex, told LincolnshireLive: "The money I have to pay the court is no problem.
"The reason I challenged it is because this was the number one camera in Britain and it's caught out many, many people.
"I accept my car was doing 57mph but I should have been able to have defended it because of the obstruction of signs."
