Thanks for all the replies. I appreciate them. The employer has tried all sorts of things about mandatory seat belt use.
However when the workers are out in the middle of no where on a job site it is hard to enforce. What i was trying to find was a video clip of a roll over that would show them how fast it takes place. I have found an excellent one from the HSE in the UK on farm tractors. I am going to show that to them in the morning.
Larry