Forest Road Engineering Guidebook - Ministry of Forests

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Forest Road Engineering Guidebook Road corridor preparation 58 Establishing clearing widths Clearing widths are established to facilitate the construction, use, and maintenance of forest roads. The objective is to minimize the width of the clearing, yet accommodate: • 1–3 m of width between standing timber and any excavation to avoid undercutting roots that may create dangerous trees and destabilize the top of road cut (see Figures 7 and 8) • the road prism, including widenings for curves and turnouts • subgrade drainage structures • landings and slash disposal without piling wood or excavated material against standing trees • borrow pits, gravel pits, quarries, and waste areas • safe sight distance for user safety • snow removal • fencing and other structures that are ancillary to the road • other special operational requirements. For natural slopes up to 60%, clearing widths can be conveniently determined from the tables in Appendix 5. For slopes greater than 60%, or in areas of moderate or high likelihood of landslides, clearing widths should be determined from the geometric road design.
3m* * Default distance from tables in Appendix 5 (distance may be less) Clearing width (see Appendix 5) Road prism Road subgrade width Forest Road Engineering Guidebook Minimum 3 m (Default distance from tables in Appendix 5) Figure 7. Typical roadway on gentle slopes with no additional clearing. 59
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Endhauling road fill pullback Endha
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Office review tion prescription and
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• vehicle usage (4-wheel drive, A
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Care should be taken in verifying i
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Field observations (prescription in
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Appendix 1. Field identification of
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Soil consistency Soil density The c
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Appendix 2. Vertical (parabolic) cu
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Design speed (km/h) Design speed (k
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Table A2.4. Vertical curve elements
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• PWL and HWL, where applicable
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Appendix 5. Tables to establish cle
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1. To compensate for a cut at the c
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Appendix 8. Example field data form
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Appendix 10. Landslide risk analysi
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• the type of materials involved
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Table A10.2. Example of a qualitati
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Table A10.7. Example of consequence
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