Forest Road Engineering Guidebook - Ministry of Forests

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Forest Road Engineering Guidebook 182 unstabilized subgrade width when determining the clearing width from the tables in this appendix. For every 0.3 m of surfacing depth, allow for an additional 1.0 m of unstabilized subgrade width. For example, to obtain a 4 m wide finished road-running surface on subgrade soils that will require a 0.3 m thickness of gravel, select Table A5.2 (5 m wide unstabilized subgrade). Compensate for other requirements: Calculate the extra width required for turnouts, sight distance, snow removal, slash disposal, etc. required on the fill side of road centreline. To determine the lower clearing width boundary, add this extra width to the offset slope distance (fill side of centreline) given in the tables. For example, if winter use of the road will require snow ploughing, the standing timber should be at least 4 m or more away from the road shoulder. Since the tables will only provide for a minimum of 3 m from the road shoulder to the lower clearing width boundary, simply add the additional 1 or 2 m to the offset slope distance. Where natural side slope angles are greater than 20% the extra width allowance should be converted to a slope distance, rounded up to the nearest metre, and then added to the offset slope distance determined from the tables.
Forest Road Engineering Guidebook Tables A5.1 to A5.7: Offset slope distances in metres from road centreline to upper (cut side) clearing width boundary and lower (fill side) clearing width boundary. �� 183
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Page 215 and 216: Table A10.7. Example of consequence
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