 | Green circle (easiest)- Most highly-developed class of trails (almost road like) with no steep hills and few obstacles.
- Intended for novice riders who have mastered the basic skills necessary for safe operation on well-developed trails.
- Also for those lacking the experience or desire to ride more difficult trails.
- Approximately 10% of trails in the system should be classified as "easiest."
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 | Blue square (more difficult)- Suitable for the majority of intermediate riders.
- More difficult trails are narrower with steeper hills and switchbacks and some moderate obstacles.
- Intended for OHV enthusiasts with well-developed skills seeking a reasonably challenging trail ride.
- Riders subjected to higher degree of risk and exposure.
- Approximately 80% of trails in the system should be classified as "more difficult."
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 | Black diamond (most difficult)- Most primitive class of trails requiring a high-level of skill and experience.
- Very steep grades, narrow trails, sharp alignments, rough or loose tread surfaces, and substantial obstacles.
- Suitable only for proficient or expert riders to test their machines—and their own skills and abilities.
- Approximately 10% of trails in the system should be classified as "most difficult."
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