A speed camera campaign designed to cut the number of accidents on north Wales roads is set to go undercover.
Arrive Alive was launched in 2001
The Arrive Alive scheme, which is run by North Wales Police, health authorities and a number of other organisations will introduce an unmarked car to track down people speeding excessively.
A spokeswoman for North Wales Police said motorbikers will be specifically targeted.
"We've had 12 motorcyclist deaths since the beginning of this year compared to seven in total last year," she said.
"The camera will only be used at weekends and only targeting excessive speeds for prosecution, there will be no money from fines," she added.
The force believes that the officers will still be highly visible to motorists.
They will be wearing luminous jackets and the equipment used will be taken from the Arrive Alive vans and used manually.
However, North Wales Police have admitted an unmarked car will be used on occasion.
Paul Smith from Safe Speed, a road safety organisation said he has concerns about the use of speed cameras.
"Going back 15 years, the UK had the safest roads in the world and no one saw a speed camera - also fatal accidents fell by 5% each year," he said.
"Drivers got on fine with police until 1993 when the police said that speed was a big killer on British roads and cameras were introduced.
"Now there is a lot of animosity between motorists and the police. People don't report crime as they used to, moreover roads aren't getting safer.
"Arrive Alive have made great claims that it's working - but it's based on statistical errors.
"They put cameras on roads where there were traditionally a lot of accidents,
"This may seem a good idea. However, accident blackspots don't really exist anymore due to modern road materials."
Mr Smith also said that speed cameras would not save bikers.
"Recklessness has been identified as a specific factor in some of the recent deaths in north Wales," he said.
"Speed cameras do not detect recklessness. Speed cameras are the wrong medicine, and increasing the dose will not work. "
Fixed and mobile safety cameras have been monitoring speed on 53 routes in the six counties of north Wales since 2001.
Figures show that casualties have fallen significantly on the blackspots targeted by the safety camera scheme.
Organisers say fatal injuries are down 38%, serious injuries are down by 34%, while slight injuries are down by 17%.