This you must read about as a man spends sixty thousand dollars on court cost for a faulty speed detector

John Busuttil, photographed with his barrister father Joe, has spent about $60,000 to get off a speeding fine. Photo: Edwina Pickles

However, the radar inside the patrol car was also operating, and it put the bike at a speed of 76km/h. The radar reading was recorded by an in-car video, which Mr Busuttil subpoenaed from police.

Mr Busuttil, who was represented by his barrister father Joe Busuttil, also engaged a surveyor and an internationally accredited radar expert, who gave evidence that it would have been impossible for the LIDAR gun to detect such a high speed at that point of the road.

The court heard that a LIDAR gun must be able to track a target in a straight line for three seconds in order to produce an accurate reading.

In June this year, Senior Constable Chaplin told Sutherland Local Court that he measured the stretch of road "hundreds of times" and it was 325 metres.

However, a report by a surveyor, tendered to the court, showed the line of sight from where Senior Constable Chaplin was standing was only 237 metres and the straight stretch of road was just 180 metres.

Senior Constable Chaplin had said the bike was still 150 metres away from where he was standing when the three-seconds lock was recorded.

Roy Zegers, who told the court he had 30 years' experience in radar equipment, said that distance would not be long enough for the LIDAR gun to get a reading if the bike was travelling at 149km/h.

In quashing the conviction, Judge Woods said: "The miscalculation by over 100 metres of the distance is extraordinary and fundamental."

He said the police officer would not have acted with malice but, in this case, it was correct to order Mr Busuttil's legal costs.

Outside the court, Mr Busuttil said he had spent 18 months and thousands of dollars to prove he was not speeding.

"It's cost a lot but it's worth it in the end," he said.

His father said police charged 22 drivers for speeding on Lady Wakehurst Drive on May 8, 2010, and 10 of them had their licences disqualified.

"I suspect there's something more going on here than just an error," he said.

He encouraged other drivers to challenge speeding fines if they believed they were not speeding.

"If you don't believe you were speeding, take them on."

Mr Busuttil's costs included about $40,000 in litigation costs, which were incurred by his father spending eight days and eight half-days in court at $3500 a day.

The rest of the costs were made up of the fees of solicitors, three expert witnesses and other expenses such as filing fees and court costs.