Since late September, hundreds of Winnipeggers have come forward saying they were slapped with photo radar tickets when they were not actually speeding at Grant Avenue and Nathaniel Street.

The Canadian Taxpayers Federation said they've received complaints from about 500 drivers.

"Photo radar has been in Winnipeg for 10 years and we've never seen so many people come forward and complain about one particular location and the readings that have come from that spot," said Colin Craig from The Canadian Taxpayers Federation.

The group Wise Up Winnipeg said that's because the readings from the photo radar are inaccurate, arguing the placement of the photo radar vehicles is the cause.

"It's not just off of the road – the distance off of the road. It's because of the many large metallic objects that you get back on an angle of reflection," said Todd Dube from Wise Up Winnipeg. He said that reflection causes problems with the speed readings.

Winnipeg police, however, said the equipment used is built to take reflection to account. It also can tag speeders up to 55 metres away, said police.

"When a vehicle parks in accordance with the way it's supposed to set up, which is parallel to the traffic on the roadway, you are in effect getting the accurate correct speed of that vehicle at the time that it passes the photo radar vehicle," said Const. Ray Howes from the central traffic unit.

Police said that since they set up at the Grant and Nathaniel location in late September, the numbers of speeders has been cut in half – proof, they say, that traffic enforcement is working in the area.

Winnipeg police said there are 10 photo radar vehicles in use in the city. Similar to the Grant and Nathaniel one, there are three set up on side roads a little father back from the flow of traffic they are monitoring.

The Canadian Taxpayers Federation said drivers who don't believe they were speeding at Grant and Nathaniel but still received a photo radar ticket should challenge it in court.

The Wise Up Winnipeg group said it will bring a photo radar expert to help fight the first ticket that goes to court, hoping when they prove the reading wasn't accurate that similar tickets will be thrown out.

- with a report from CTV's Caroline Barghout