Alaska Village Roads Guide: Suggested Roadway Geometrics and Design Considerations for Alaska Village Roads with Mixed Use

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Ultra-low-volume roads guide ...
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Author
Connor, Billy
Belz, Nathan
Keyword
Low Volume Roads
road design
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URI
http://hdl.handle.net/11122/16265
Abstract
The ultra-low-volume roads guide is designed to provide guidance for the construction of roadways in rural, isolated, Indigenous, or tribal areas with less than 100 average daily trips (<100 ADT). These roads serve a unique purpose in their communities and warrant special considerations in their design. This guide enumerates design guidelines and considerations to help designers match roadway function and design while maximizing safety, economic efficiency, and suitability for community needs.
Table of Contents
Abstract ................................................................................................... 1 CHAPTER 1. Introduction ..................................................................3 1.1. Overview ........................................................................................... 3 1.2. Definitions of Village Roads and Street Functions ........................................................................ 3 1.3. Design Philosophy and Basis for Recommendations .................................................................... 4 1.4. Transportation Planning and Design Processes ............................................................................ 4 CHAPTER 2. Design Guidelines .................................................................................................................. 5 2.1. General Design Guidelines ............................................................................................................ 5 2.2. Design Speeds and Speed Management ....................................................................................... 6 2.3. Typical Sections ............................................................................................................................. 7 2.4. Width ............................................................................................................................................ 7 2.5. Grades ........................................................................................................................................... 8 2.6. Crowns .......................................................................................................................................... 8 2.7. Turnouts ........................................................................................................................................ 8 2.8. Roadside Design ............................................................................................................................ 9 2.8.1. Clear Zones ............................................................................................................................ 9 2.8.2. Guardrails and Traffic Barriers ............................................................................................ 10 2.8.3. Drainage .............................................................................................................................. 10 2.9. Horizontal Alignment .................................................................................................................. 10 2.10. Stopping Sight Distance .............................................................................................................. 12 2.10.1. Horizontal Curves ................................................................................................................ 13 2.10.2. Vertical Curves .................................................................................................................... 15 2.11. Traffic Control and Intersections ................................................................................................ 15 2.11.1. Clear Sight Triangles ............................................................................................................ 16 2.11.2. Intersections with No Control or Yield Control ................................................................... 17 2.12. Other Roadway Infrastructure .................................................................................................... 18 v 2.12.1. Shared Use and Side Paths .................................................................................................. 18 2.13. Other Considerations .................................................................................................................. 18 2.13.1. Bridge Width ....................................................................................................................... 18 2.14. Signage ........................................................................................................................................ 18 2.14.1. Design .................................................................................................................................. 18 2.14.2. Signs and Plaques Sizes ....................................................................................................... 19 2.14.3. Visibility ............................................................................................................................... 19 2.15. Roadway Lighting ........................................................................................................................ 20 CHAPTER 3. REFERENCES ........................................................................................................................ 21
Date
2025-10
Type
Technical Report
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