System used by Extreme4x4.com.
|Circle||0-4||CIRCLE - EASY: Stock four-wheel drive vehicles of any kind can travel a circle-rated trail.|
|Square||5-8||SQUARE - MODERATE: Four-wheel drive needed, as well as some driving skill. Larger tires and a traction-aid in a differential will make square-rated trails easy.|
|Diamond||9||DIAMOND - DIFFICULT: Modified 4x4's required. Locking differentials, larger tires and suspension modifications, as well as good driving, will stand you in good stead on these roads and trails (a diamond-rated trail is equal to the old 4+-rating, so don't think a diamond trail is going to be easy).|
|Double Diamond||10||DOUBLE DIAMOND - EXTREME: These are the ones we like. Well-modified 4x4's and experienced drivers MAY be able to get through these roads and trails. Body and mechanical damage likely.|
Note: Trail ratings are highly subjective. A trail that is easy for an experienced driver with a highly modified vehicle may be impassable for a novice driver in a stock vehicle. Weather conditions may also significantly affect the difficulty of a trail. Also, the difficulty of a trail may change over time, as trail use, weather, and maintenance modify the trail. Always check with the managing organization and/or recent users before planning a trip on a trail and scout ahead on foot if you are not sure of current conditions.