Alberta Justice is refunding all Speed on Green tickets issued in Edmonton since November 2009 after a camera clocked a vehicle traveling at an impossible speed in the heart of the city.

Calgary police say we have 28 Speed on Green cameras operating in the city but they argue these are an older, tried, and tested model than the ones used in Edmonton.

Calgary is trying four of the newer cameras in a pilot project but so far the new cameras have never been used to issue tickets.

Not everyone is convinced and those who fight speeding tickets on a daily basis argue that no technology is 100 per cent reliable.

Edmonton won't be prosecuting any Speed on Green tickets until the technology issues are resolved