Dearest brainbombe, are you trolling ? Who owns the roads you intend to use ? As long as you intend to only use your vehicle on your own private land, then imho you may decline to wear a safety belt. However, once you decide to use your vehicle on public roads then you have to comply with the laws, regulations and rules that apply, similarly if you want to use your vehicle on a privately owned road, eg commercial tollway then you are required to agree to the terms and conditions of the " contract of use" offered by the tollway operator.
It's like stopping at a stop sign, or red light you ninny. Road accidents cost the taxpayer money, so the state on behalf of it's citizens has the legal power and responsibility to enact laws regulating the use of public areas, particularly roads simply to minimise the cost to taxpayers for " picking up the pieces" . There's also liability issues, an owner of a road who doesn't act reasonably to ensure safety of use for users fails a duty of care responsibility, and could be found to have been negligent and have partial responsibilty for accidents and be liable for compensating victims. You cannot deny the "owners" of roads their rights to control the use of their property.