This is the system used by the Black Hills Jeeps club.
VERY similar to the Black Hills 4 Wheelers' system.
|1||1-2||Passable by stock and 2WD vehicles, improved dirt, gravel etc.|
|2||3-4||Scenic, touring trail ride; four wheel drive required occasionally, some mud holes or rocks that would stop most other vehicles are traveled easily in 4WD.|
|3||5-6||For novice and experienced drivers alike; Listed on the Black Hills Forest trail map as unimproved or 4wd, the most fun four wheeling you can expect to have in a stock four wheeler; low range may be required often; vehicle damage is a possibility.|
|4 to 4+||7-8||Not advisable for novice drivers; potentially dangerous situations; maximum ground clearance, lowest gears, and minimum tire size of 33 inches required; lockers, limited slips, winches, and jacks advised due to moderate to large rocks and obstacles, vehicle damage is likely. Full size vehicles limited to specific trails at this rating.|
|5 to 5+||9-10||For the hard core experienced driver; extremely dangerous situations; maximum ground clearance, lowest gears, minimum tire size of 33 inches, two lockers, and winch are required. Full size vehicles limited to specific trails at this rating. jacks and winches indispensable due to large boulders, steep inclines; vehicle damage assured. Full size vehicles limited to specific trails at this rating.|
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.