Most pistes I ride on are constructed and maintained for 4-wheeled vehicles. If there are recent 4-wheel tyre tracks it gives you an indication the route is passable.
My home-brewed colour coding system is based on French ski piste colours, but intended for bikers riding a typical 180-220kg 'adventure' bike such as a BMW 1200GS or BMW 800GS.
Green is a graded track using ballast material trucked in from elsewhere and properly levelled and beaten down. Suitable for Honda Gold Wings, two-up, towing a trailer.
Blue is an easy track that is constructed using on-site materials so varies along the route, might be gritty sand, then stones, then blasted out of rock, then beaten earth. But it's easy enough for a novice who has no off-road training.
Red is a track that has tricky sections, so off-road training is recommended, but if there's several of you together you could help novices by offloading luggage on tricky sections and manhandling the bikes.
Black is something that an average off-road rider shouldn't do on their own, or with luggage. Unfortunately whenever I find these I seem to be alone with full luggage!
If you are an off-road god on a much lighter bike you may wonder what the fuss of the 'black route' was all about. Conversely these ratings get thrown out of the window after heavy rain, a good example being the E33 Gorge Link route which can take two hours, but once took 14 hours, the last six by moonlight.
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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