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> design requirements<br />
12<br />
ROAD SURVEY REFERENCE<br />
B.M.# 10<br />
ELEV. 671.11<br />
REFERENCE# 20<br />
STA. 15 + 300.41<br />
BRG. 110° 50'<br />
DIST. 18.23<br />
PROJECT NAME_______________<br />
SURVEYOR NAME____________<br />
DATE (Day/Mo/Yr) _______________<br />
Benchmark<br />
The purpose <strong>of</strong> road design is to produce design specifications for road construction<br />
by determining the optimum road geometry that will accommodate<br />
the design vehicle configuration for load and alignment, and traffic volume,<br />
and provide for user safety, while minimizing the cost <strong>of</strong> construction, transportation,<br />
maintenance, and deactivation. The optimum road design should<br />
minimize impacts on other resources by minimizing clearing and road<br />
widths, minimizing excavation, using rolling grades, and installing proper<br />
drainage structures.<br />
<strong>Road</strong> design s<strong>of</strong>tware has been developed to replace manual drafting and<br />
repetitious design calculations so that various alignment alternatives can be<br />
quickly evaluated. Once the location survey data have been entered into the<br />
road design program, select and input appropriate design parameters for the<br />
specific project. Ensuring this requires direction from a skilled and knowledgeable<br />
designer familiar with forest road layout, design, and construction<br />
practices. As each phase <strong>of</strong> road layout and design builds on the previous<br />
phase, the quality <strong>of</strong> the final design depends on the appropriateness <strong>of</strong> the<br />
road location, field data, and survey—and the competence <strong>of</strong> the designer.<br />
General design requirements<br />
Survey flagging<br />
Plaque<br />
(include road survey<br />
reference information,<br />
see details to left)<br />
1.2 m<br />
Figure 1. Typical benchmarks and reference.<br />
This section provides road design requirements common to all levels <strong>of</strong> road<br />
layout and design. Construction techniques, road width, cut and fill slope<br />
angles, and horizontal and vertical control angles are selected according to<br />
terrain and soil conditions for the required road standard. <strong>Forest</strong> road standards<br />
are defined primarily in terms <strong>of</strong> stabilized road width and design<br />
speed.
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