TRANSPORT has been revealed as the biggest killer on farms after a major clampdown on sheep farmers in Kirklees and Calderdale.
Quad bikes have already claimed three lives this year, say Health and Safety Executive officials.
And eight out of twelve prohibition notices served during their local campaign involved the use of quad bikes without helmets.
The notices stop an activity until remedial action is taken.
The powerful quad bikes - used by farmworkers to get across fields - was one of the main targets of the campaign.
Inspectors targeted more than 100 farms and carried out 85 preventative inspections in Kirklees and Calderdale.
The six-week blitz, this month and last, aimed to highlight transport safety and health precautions.
HSE inspector Neil Hope-Collins, who organised the blitz, said: "Transport is the biggest killer on farms and this year there have been three deaths involving the use of quad bikes.
"Two of those killed were under 16.
"Our enforcement line on this and the other issues raised spread rapidly through the local farming community.
"For HSE this sort of response is a real and positive benefit which is only triggered when we do concentrated campaigns like this."
The campaign also concentrated on sheep and livestock handling, falls from height, managing asbestos, and lone working.
Two other prohibition notices involved using chain saws without protective equipment, one was for unsafe machinery and one for a broken ladder.
Eleven improvement notices were also issued for farmers to improve particular aspects of safety.
These involved training, pesticide storage and tractor safety.
Robert Nobles, Huddersfield group secretary of the National Farmers Union, said the campaign had been well-received and had helped the farming community raise awareness on health and safety issues.
"People's safety has to be paramount at all times."