In reply to ChrisJD:
Ugly but true.
In my mind there is a clear set of difference between human/animal power and cars, all of which make the later less suitable for use on shared access, non metalled roads on our mountains or fells:
1. Noise - nothing spoils a nice day out in the countryside like a bunch of trail bike engines revving intermittently all the bloody time. This simply isn't comparable to anything walkers could generate short of them all packing ghetto-blasters and MC hammer.
2. Damage to the landscape - horses can chew a path up pretty badly in the winter, as can mountain bikes. But you come back a few months later and you'd not know it. The same can't be said for a trail bike or car that's sat there spinning a wheel and gouging a bloody big hole in the landscape, and even in good conditions these cause a lot more impact.
3. Safety. A car or trail bike is a much more lethal implement than a walker or a rider and their bike, combining increased mass/momentum, increased speed etc. They should be segregated from foot traffic - near misses with some pie eater on a trail bike really aren't fun.
4. Environment - face it, reckless use of fossil fuels is a really bad thing, and whilst off roading isn't using much of it, it's a poster child for a reckless waste of a precious resource with harmful effects.
If a 4x4 driver decides that despite all this, some laws dating back to before cars even existed mean they have a right to tear up shared paths in the countryside, that speaks volumes about their ugly personality.
There are plenty of dedicated off-road facilities where people can tear up the countryside with 4x4s, so why they should be allowed onto unsurfaced green lanes is beyond me. If I was the dictator I would bring an end to almost all BOATs and other tracks for 4x4s and encourage the construction of more dedicated 4x4 off road playgrounds, considering the following points:
1. Safety will be greatly increased for everyone
2. The facilities can be made much more fun for the drivers, as:
2a. You have the leeway to engineer all sorts of obstacles and challenges that don't exist on BOATs
2b. You don't have to worry about preserving a sensitive eco-system as you can just repair things at the end of the week.
3. The 4x4 drivers aren't exactly poor and can afford a fee for a playground just like many other people with activities that need a degree of management to safeguard the landscape.
*simples*