Gardaí have played down the extent of inaccuracies with the GoSafe speed cameras.
Senior officers have told an Oireachtas committee that the number of speeding charges from GoSafe cameras is no higher than those caught by gardaí.
It follows claims that a series of summonses had been struck out because of problems setting up the cameras, which then detected some drivers as 'speeding' when they were within the limits.
Superintendent Cornelius O'Donohoe of the Garda National Traffic Bureau has said the machines are given regular checks to make sure they are working properly.
"We're fully satisfied at all times that the equipment is being maintained and the public can have full confidence that the equipment is to the best and highest standard out there. An Garda Siochana are overseeing that all the time."
"In every court case, the operator is in a position to produce the certification from the people who carry out the checks on them in the prosecution of the case," he added.