Although I agree with general statements here, and I am a newbie at only 40 yrs experience, lol, I will keep an open mind as to when a seat belt might not be safe to use. However, accidents do happen even when you are moving the unit 2 inches. So, when is it not safe to wear a seat belt? Turning from the hips to see behind is not affected by the seat belt. Loading and unloading trucks is a definite time to wear it, no excuses. Up or down a ramp? Up the ramp and you can't see for the load means you must have a spotter. Can't agree there. In and out of the unit several times builds complacency and so is a must time. As I said, I will keep an open mind, BUT, I have yet to come across a situation whereas it is not safe to wear your seat belt in my limited time of 40 years. Just my 2 cents worth.