A ROAD safety group in Huddersfield alerted police after death threats were made against its leader.
Mary Williams, chief executive of Brake, was singled out for the verbal attacks in a message board on a website run by people who like fast cars.
But Brake felt the messages which appeared after Ms Williams spoke out in favour of speed cameras were so threatening they contacted West Yorkshire Police and made an official complaint about the website www.pistonheads.com
Brake spokesman Simon Collister said: "Essentially the threats made against Mary were death threats and were posted on a noticeboard in a chat room.
"This all came about when Mary appeared on a TV programme last week talking about the effectiveness of speed cameras.
Ms Williams said: "Anti-camera campaigners who break laws such as avoiding paying fines, necklacing (setting on fire) cameras or making nasty threats against individuals working for road safety, are being exposed for what they are - bully boys.
"Brake will continue to support Government policy on speed cameras on the evidence of their success at reducing speeds and casualties - a 35% reduction in casualties in the pilot areas."
David Edmonston, a spokesman for the pistonheads website, said this morning: "This matter has come as a great shock to us.
"Far from being a bunch of crazed lunatics, the site is by and large frequented by a group of mature professional men and women who share a passion for their cars."
And he downplayed the threats that appeared on the site.
He said: "It was a jocular response to what the members perceive as increasingly draconian and unfair limitations on their personal freedoms and, in particular, the use of unsubstantiated and just plain false emotive arguments by certain pressure groups.
"I am very confident indeed there is no substance whatsoever to the allegation that a threat to kill Ms Williams was made by any of our members."
Chief Insp Martin Sykes said: "We have investigated and spoken to both Brake and the website organisers and I am satisfied there has been nothing that constitutes an offence.
"It is not appropriate to take further police action at this stage."
The remarks at the centre of the allegations have been removed from the website.