LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Appendix F – Guidelines for Traffic Impact StudiesSection F.5 Intermediate Traffic Impact Study3. Identification of all bridges or other roadway structures in the traffic impact areathat have been determined to be structurally deficient or functionally obsolete bythe Engineer.4. Current and projected average daily traffic volumes on all unpaved or gravelroads in the traffic impact area. Projected daily traffic volumes shall be based onfull buildout of the proposed development or land use action and on anycommitted (approved) development that would contribute to the traffic volumeson roads in the traffic impact area.5. A brief summary of whether or not the capacity and level of service requirementsfor the unpaved or gravel roads will be satisfied if the proposed development orland use action is approved and constructed. If the capacity and level of servicerequirements will not be satisfied, describe the improvements that must beconstructed to satisfy the requirements. In addition, provide a brief analysis ofthe adequacy of road pavements and/or bridges and roadway structures in thetraffic impact area (See Section F.7, below).F.5 INTERMEDIATE TRAFFIC IMPACT STUDYF.5.1 When an Intermediate Traffic Impact Study is RequiredThe County requires at least an Intermediate Traffic Impact Study for any proposeddevelopment or land use action that will generate traffic volumes that will impact thecapacity, safety, or structural integrity of the roadway system. The following areexamples of proposed developments or land use actions that will require an IntermediateTraffic Impact Study:1. Rezoning. A rezoning application increasing the intensity of land use where atraffic impact study has previously been approved.2. Plats. Any general development plan or preliminary plat meeting the followingcriteria, or a final plan meeting the criteria when a traffic impact study was notapproved for the preliminary plat.a. Residential Plats: Residential plats with more than 2 but no more than 20new dwelling units.b. All Other Plats: All other plats where the volume of new traffic generated willbe more than 20 but no more than 200 vehicle trips per day. Plats withaccess to collector or arterial roads may require an analysis of access designand location.3. Site Plans or Special Reviews. Any site plan or special review where the volumeof new traffic generated will be more than 20 but no more than 200 vehicle tripsper day.F.5.2 Intermediate Traffic Impact Study RequirementsThe Intermediate Traffic Impact 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 paved roads in the traffic impact area, a description of the typeof pavement, and a description of the condition of the pavement.Larimer County Rural Area Road Standards Page F-4October 22, 2007
Appendix F – Guidelines for Traffic Impact StudiesSection F.6 When A Full Traffic Impact Study is Required3. Identification of all existing and proposed traffic signals in the traffic impact area.4. Identification of all bridges or other roadway structures in the traffic impact areathat have been determined to be structurally deficient or functionally obsolete bythe Engineer.5. A summary table listing each type of land use in the proposed development orland use action, the size or amount involved, the trip generation rates used, andthe resultant average daily trips generated. Trip generation must be calculatedusing the latest data contained in the Institute of Transportation Engineers (ITE)Trip Generation manual. If several trip generation rates are listed in the ITEmanual, use the highest rate or provide sufficient justification for a lower rate.Trip generation rates for any land use not easily defined using the ITE manual orfrom any other trip generation data source must be clearly noted.6. The percentage distribution of trips from the proposed development or land useaction to other roads in the traffic impact area.7. Current and projected average daily traffic volumes on all roads in the trafficimpact area. Projected daily traffic volumes shall be based on full buildout of theproposed development or land use action and on any committed (approved)development that would contribute to the traffic volumes on roads in the trafficimpact area as well as growth in background traffic.8. A description of capital improvements to roads in the traffic impact area that areunder construction or planned by any public agency or private entity and theschedule for completing such improvements.9. A summary of whether or not the requirements for capacity, level of service, andadequacy of pavements and structures (See Section F.7, below) for all roads inthe traffic impact area will be satisfied if the proposed development or land useaction is approved and constructed. If the capacity, level of service, andadequacy of pavement and structure requirements will not be satisfied, describethe improvements that must be constructed to satisfy the requirements.F.6 WHEN A FULL TRAFFIC IMPACT STUDY IS REQUIREDF.6.1 When a Full Traffic Impact Study is RequiredA Full Traffic Impact Study will be required for any proposed development or land useaction that will create more than 20 new dwelling units or generate more than 200 newvehicle trips per day, or when determined to be necessary by the Engineer.F.6.2 Full Traffic Impact Study RequirementsThe Full Traffic Impact Study must include at least the following information:1. Describe the traffic impact area, including at a minimum those elementsdescribed in Section F.2. The traffic impact area must be expanded to includethe following:a. All pedestrian or bicycle routes within 1 ½ mile of a schoolb. All routes to any public or commercial attraction within a ten minute walk orbicycle ride from the site.c. All routes to transit facilities within a ten minute walk of the site.Larimer County Rural Area Road Standards Page F-5October 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 132 and 133: 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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