LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Appendix F – Guidelines for Traffic Impact StudiesSection F.2 Defining a Traffic Impact Area3. Proposed access(es) and their relationship to adjacent properties and theiraccesses4. Preliminary estimates of the site’s trip generation, trip adjustment factors, if any,and trip distribution at build-out5. Proposed phasing plan and anticipated year of build-out6. Anticipated roadway improvements7. Special analysis needsCompletion of the TIS scoping will result in mutual agreement between the County andthe Applicant regarding the level of detail and extent to which the TIS will need toaddress each of the following:1. Study area for the impact analysis2. Other development to include3. Existing intersection counts4. Intersections to be studied5. Background traffic volume forecasts6. Special Analysis needs (This may include consideration and/or comparativeanalysis of modern roundabouts as intersection control type)The completed and signed base assumptions form and any attachments shall beinserted in the TIS.F.1.4 Review by CountyThe Engineering Department will review all traffic impact studies, with input from othercounty departments as needed. All studies must be approved by the Engineer.F.2 DEFINING A TRAFFIC IMPACT <strong>AREA</strong>Traffic impacts must be analyzed within a traffic impact area. The limits of this impact area shallbe based on the size and extent of the application for development approval, the existing andfuture land uses, and traffic conditions on and near the site. Determination of the boundaries ofthe traffic impact area is at the discretion of the Engineer, but is typically done in consultationwith the Applicant during the scoping meeting.Because concerns related to traffic impacts due to specific land use actions can vary greatly,the determination of a traffic impact area is done on a case-by-case basis; however, at aminimum the limits of the study area should include:A. Internal roadsB. Adjacent roadsC. Access locations and/or new intersectionsD. Off-site roads to the nearest paved County collector or arterial road or state highwayLarimer County Rural Area Road Standards Page F-2October 22, 2007
Appendix F – Guidelines for Traffic Impact StudiesSection F.3 Level of Service, Access, Auxiliary Lane Requirements and Passenger Car EquivalentsE. Off-site roads where traffic from the proposed development or land use action willaccount for at least 20% of the average daily traffic upon build-out.F. Off-site intersections where traffic from the proposed development or land useaction:1. Contributes a 10% impact of the peak hour traffic on any approach leg of anintersection where the intersection is operating at a level of service C or betterupon build-out.2. Contributes a 5% impact of the peak hour traffic on any approach leg of anintersection where the intersection is operating at a level of service D or worseupon build-out.3. Impacts a specific turning movement that currently does not have an auxiliaryturn lane by at least 50% of the peak hour volume warrant for an auxiliary turn.F.3 LEVEL OF SERVICE, ACCESS, AUXILIARY LANE REQUIREMENTS ANDPASSENGER CAR EQUIVALENTSA. The acceptable level of service (LOS) (per the Highway Capacity Manual) for ruralroadways in unincorporated Larimer County (outside Larimer County adopted growthmanagement areas) is detailed in the Larimer County Land Use Code and is a LOSC.B. Access spacing is detailed in Chapter 10 of this document.C. Auxiliary lane warrants are included in Chapter 4 of this document.D. Unless specifically noted, all criteria in these standards are based on automobileoperations and performance. To allow for the impact of larger trucks, buses, andrecreational vehicles, “passenger car equivalents” shall be determined. A passengercar equivalent of 3 for each bus and all trucks and combinations of 40 feet in lengthor longer, or a passenger car equivalent of 2 for each vehicle or combination at orover 20 feet in length but less than 40 feet shall be used for these purposes.F.4 PAVING THRESHOLD STUDYF.4.1 When a Paving Threshold Study is RequiredThe County requires a Paving Threshold Study for any development proposal that willcreate more than two (2) new dwelling units or that is expected to generate more thantwenty (20) new daily vehicle trips on an unpaved or gravel road in the traffic impactarea.F.4.2 Paving Threshold Study RequirementsThe Paving Threshold Study must include at least the following information:1. A location map showing the development site, the boundaries of the traffic impactarea, and all roads, intersections, bridges or other roadway structures in thetraffic impact area.2. Identification of all unpaved or gravel roads in the traffic impact area and adetermination as to whether the gravel has been treated with chemicals for dustsuppression.Larimer County Rural Area Road Standards Page F-3October 22, 2007
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LARIMER COUNTYRURAL AREA ROAD STAND
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Table of Contents3.3.11 Typical Str
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Table of ContentsCHAPTER 8 - ENVIRO
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Table of Contents12.3.7.2 Conventio
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Table of ContentsG.7.12 Other Permi
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Chapter 1 - General InformationSect
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Chapter 2 - Submittal ProceduresSec
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Chapter 2 - Submittal ProceduresSec
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Chapter 3 - Submittal Requirements
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Chapter 4 - Road Design and Technic
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4.9.1.7 Design VehiclesChapter 4 -
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CHAPTER 5 - GEOTECHNICAL STANDARDS
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Chapter 5 - Geotechnical Standards
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Chapter 6 - STORMWATER MANAGEMENTSe
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Chapter 7 - Bridges and Major Drain
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Chapter 8 - Environmental and Agric
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Chapter 8 - Environmental and Agric
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9.1.3 DefinitionsChapter 9 - Roadwa
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CHAPTER 10 - ACCESS REQUIREMENTS AN
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Chapter 10 - Access Requirements an
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CHAPTER 11 - ACCESS AND UTILITY PER
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Chapter 12 - Right of Way Permittin
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Page 93 and 94: Appendix A - Definitions and Abbrev
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Page 112 and 113: Appendix D - Construction Standards
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Page 134 and 135: Appendix F - Guidelines for Traffic
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Page 154 and 155: Appendix H - General NotesSection H
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LARIMER COUNTY RURAL AREA ROAD STANDARDS

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