LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Chapter 4 – Road Design and Technical CriteriaSection 4.3 Road DesignTable 4-1Road Standards – Technical Design CriteriaCollectorDesign Element Arterial Major Minor Local RoadsDesign SpeedPosted Speed50 - 6045 - 5545 - 6040 - 5535 - 5035 - 452525Minimum centerline radius NA 1039’-NA 510’-NA 165’(with no super-elevation)Maximum super-elevation 0.08 ft/ft 0.08 ft/ft 0.08 ft/ft NAMinimum tangent between 400’ 400’ 200’ 100’curves or at intersectionsMinimum Centerline arc 400’ 300’ 300’ 100’lengthsMax Centerline Gradeflat/rolling8%8% 8% 8%Mountains10%10% 10% 10%Minimum Centerline 0.5% 0.5% 0.5% 0.5%GradeMinimum Crest 84-151* 61-151 29-84 12K-values for Sag 96-136 79-136 49-96 26Vertical Curves*Right of Way (ROW) Width 120’ 100’ 80’ 70’* Range varies based on design speed.e. Off-Site Design Centerline, Flowlines and Cross Sections. To assure thatfuture road improvements will meet these Standards the design of thecenterline, flowline, and cross sections of all roads, except cul-de-sacs, shallbe continued for 500 feet beyond the proposed construction. The grade andground lines of all Arterials shall be continued for a total of 1000 feet beyondthe end of the proposed construction.f. Overlay Areas. At a minimum, areas that will be overlayed must be designedto show at least a typical cross section for the area to be overlayed; a planview with notes depicting areas that need: a leveling course, taper milling,patching, fabric, etc.; and notes about accesses and shouldering. Additionalinformation may be required by the Engineer depending on the situation.4.3.2.2 Vertical Alignmenta. Maximum and Minimum Grades for Roads. The maximum and minimumgrades for specific road classifications are shown in to Table 4-1.b. Grade Breaks. No single point grade break shall exceed 0.50 percent.c. Requirements for Using Vertical Curves. Vertical curves are required forgrade changes that exceed 0.50 percent. A series of grade breaks may beused in lieu of a specified vertical curve as long as the series of breaks meetthe vertical curve criteria in these Standards for the design speed. K-valuesfor design shall conform to Table 4-1.Larimer County Rural Area Road Standards Page 4-3October 22, 2007
Chapter 4 – Road Design and Technical CriteriaSection 4.3 Road Designd. Vertical Clearance. Vertical clearance above a roadway is a minimum of13.5 feet.e. Off-Site Continuance of Grade and Ground Lines. To assure that futureroad improvements will meet these Standards the grade and ground lines ofall local and collector roads, except cul-de-sacs, shall be continued for 500feet beyond the proposed construction. The grade and ground lines of allArterials shall be continued 1000 feet beyond the end of the proposedconstruction.4.3.2.3 Sight DistanceSight distance requirements shall meet Section Four of the State of Colorado StateHighway Access Code (most recent version).4.3.3 Cross SlopeCross slope on a pavement is provided to drain water from the road surface. The designof cross slope shall consider driver comfort and safety.4.3.3.1 Minimum Cross SlopeA minimum cross slope on all new roads shall be 2.0 percent. Minimum cross slopeon reconstruction or overlays is 1.5 percent.4.3.3.2 Maximum Allowable Cross SlopeMaximum allowable cross slope on all new construction shall be 3 percent. Maximumallowable Cross Slope on any reconstruction or overlays of existing roadways shallbe 4 percent.4.3.3.3 Cross Slope for Road ModificationsWhen widening an existing road or adding turn lanes to an existing road, theresulting cross slope of the widened portion shall be within the limits stated aboveand the new cross slope shall be no less than the existing cross slope.However, if the cross slope of the existing road exceeds 4 percent the cross slopeshall be made acceptable by:a. Leveling and overlaying with HMAb. Milling the existing asphalt to an acceptable cross slope and overlaying withHMAc. Removing the existing asphalt, and reconstructing the roadway to meet thestandards.4.3.3.4 Cross Slope for Cul-de-SacsRefer to Standard Drawing 6 for cul-de-sac bulb cross slopes.4.3.4 Superelevation on Horizontal CurvesThe purpose of superelevating a roadway is to improve the riding comfort on curveswhere the traveling speed is great enough to develop excess centrifugal force that is notcounteracted by friction between the roadway and the tires of a vehicle. It is also used tomaintain the riding comfort on smaller than standard curves.Larimer County Rural Area Road Standards Page 4-4October 22, 2007
Page 1 and 2: LARIMER COUNTYRURAL AREA ROAD STAND
Page 3 and 4: Table of Contents3.3.11 Typical Str
Page 5 and 6: Table of ContentsCHAPTER 8 - ENVIRO
Page 7 and 8: Table of Contents12.3.7.2 Conventio
Page 9 and 10: Table of ContentsG.7.12 Other Permi
Page 11 and 12: Chapter 1 - General InformationSect
Page 17 and 18: Chapter 2 - Submittal ProceduresSec
Page 19 and 20: Chapter 2 - Submittal ProceduresSec
Page 21 and 22: Chapter 3 - Submittal Requirements
Page 27: Chapter 4 - Road Design and Technic
Page 31 and 32: Chapter 4 - Road Design and Technic
Page 35 and 36: 4.9.1.7 Design VehiclesChapter 4 -
Page 39 and 40: CHAPTER 5 - GEOTECHNICAL STANDARDS
Page 41 and 42: Chapter 5 - Geotechnical Standards
Page 49 and 50: Chapter 6 - STORMWATER MANAGEMENTSe
Page 51 and 52: Chapter 7 - Bridges and Major Drain
Page 53 and 54: Chapter 8 - Environmental and Agric
Page 55 and 56: Chapter 8 - Environmental and Agric
Page 57 and 58: 9.1.3 DefinitionsChapter 9 - Roadwa
Page 59 and 60: CHAPTER 10 - ACCESS REQUIREMENTS AN
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Page 71 and 72: CHAPTER 11 - ACCESS AND UTILITY PER
Page 73 and 74: Chapter 12 - Right of Way Permittin
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Chapter 12 - Right of Way Permittin
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Appendix A - Definitions and Abbrev
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Appendix A - Definitions and Abbrev
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APPENDIX B - REFERENCES AND RESOURC
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APPENDIX D - CONSTRUCTION STANDARDS
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Appendix D - Construction Standards
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APPENDIX E - CONSTRUCTION TESTING F
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Appendix F - Guidelines for Traffic
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APPENDIX G - DESIGN AND CONSTRUCTIO
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Appendix G - Design and Constructio
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Appendix H - General NotesSection H
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APPENDIX I - VARIANCE REQUEST SUBMI
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LARIMER COUNTY RURAL AREA ROAD STANDARDS

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