Forest Road Engineering Guidebook - Ministry of Forests
Forest Road Engineering Guidebook - Ministry of Forests
Forest Road Engineering Guidebook - Ministry of Forests
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<strong>Forest</strong> <strong>Road</strong> <strong>Engineering</strong> <strong>Guidebook</strong><br />
<strong>Road</strong> corridor preparation<br />
58<br />
Establishing clearing widths<br />
Clearing widths are established to facilitate the construction, use, and maintenance<br />
<strong>of</strong> forest roads. The objective is to minimize the width <strong>of</strong> the clearing,<br />
yet accommodate:<br />
• 1–3 m <strong>of</strong> width between standing timber and any excavation to avoid<br />
undercutting roots that may create dangerous trees and destabilize the top<br />
<strong>of</strong> road cut (see Figures 7 and 8)<br />
• the road prism, including widenings for curves and turnouts<br />
• subgrade drainage structures<br />
• landings and slash disposal without piling wood or excavated material<br />
against standing trees<br />
• borrow pits, gravel pits, quarries, and waste areas<br />
• safe sight distance for user safety<br />
• snow removal<br />
• fencing and other structures that are ancillary to the road<br />
• other special operational requirements.<br />
For natural slopes up to 60%, clearing widths can be conveniently determined<br />
from the tables in Appendix 5. For slopes greater than 60%, or in<br />
areas <strong>of</strong> moderate or high likelihood <strong>of</strong> landslides, clearing widths should<br />
be determined from the geometric road design.
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