In reply to lummox:
Mmm, it's a tough one. I can see both sides of the argument (yours and Andy N's) and while I wouldn't want to see it happen on all forest tracks across the Highlands, I think there is scope for roads like Beinn Dearg to be given a try.
Evidence against - the amount of crap along the Loch Arkaig road at every available camping spot really despoils the feel of the glen. In contrast, Glen Strathfarrer, with managed access, is pretty much pristine and all the more beautiful for it. The people who walk and cycle in to camp aren't the type to leave rubbish behind and the drivers obey the rules and come in and out in a day. Same goes for those staying at Strawberry Cottage in Glen Affric - one or two cars don't spoil the splendour of the glen (especially as there are always a few FC and estate vehicles around anyway). But I would guarantee that if the forest road was opened to the public, the place would be trashed. So some places do need managing and protecting.
Evidence for - like Andy said, it takes out the drag and boring bit of the day, lengthens time for climbing and will keep you fresher for more days on the hill. That might sound selfish but who hasn't wished they could park at the top Ben Nevis car park if they could. Me for one! Any cars parked up there would be screened by the trees so little or no landscape impact. I've always wanted to climb Emerald and Penguin Gullies too so if there's any chance of making a long trip from the South Lakes a bit easier then bring it on. Lock the gate with a combination lock and get people to contact the MCofS for it - then review after winter.
For other routes, improve for mountain bikes - wider and shallower drainage ditchs and easier gradients if possible.
Laters,
Davie