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d. Trails should avoid sharp curves, keep curves gradual, avoid curves <br /> at the bottom of kills. <br /> <br /> e. Trail width (one way) <br /> <br /> (1) flat and gentle slopes 3' - 4' <br /> (2) moderate slopes 6' - 8' <br /> (3) steep slopes 9' - 10' <br /> <br />f. Vertical clearance 7' - 8' above snow <br />g. Horizontal clearance - as necessary <br />h. Trail surfacing should be natural or wood chips. <br /> <br />i. Access to trails should be every five to ten miles in the Rural Service <br /> Area and every one mile in the Urban Service Area. <br /> <br />Hiking Trail Guidelines <br /> <br /> a. Slopes should average 5 percent; slopes of more than 15 percent should be <br /> avoided since these are tiring and can create erosion problems. <br /> <br /> Trail width should be 4' - 6' <br /> <br />c. Horizontal clearance 8' - 10' <br /> <br />d. Vertical clearance 8' <br /> <br /> e. Typical trail surfacing includes asphalt, concrete,.~wood ah-~ps and <br /> natural surface. <br /> <br />Snowmobile Trail Guidelines <br /> <br />a. Safety considerations for snowmobiling include adequate sight distances <br /> (200' - 300'), adequate signing of areas such as road crossings and <br /> intersections. Trails should avoid road crossings where feasible. <br /> <br />b. Trails should be laid out to hold snow. Methods of achieving this are: <br /> <br /> (1) north facing slopes; avoid south facing slopes <br /> <br /> (2) valleys <br /> <br /> (3) areas of vegetation <br /> <br /> (4) woods <br /> <br /> (5) tree lines <br /> <br /> Trails should follow the fall line of slopes and not run parallel <br /> zo contours for long distances. Trails on side slopes can cause <br /> easy sliding of snowmobiles. .. <br /> <br />d. Snowmobile trails should be 15 to 50 miles long. <br /> <br />e. Occasional open areas are desirable. <br /> <br />f. Curves should not have a radius of less than 25 feet. <br /> <br />g. Trails in the Urban Service Area can be bermed and/or planted for <br /> noise control where necessary. <br /> <br />-11- <br /> <br /> <br />