LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Appendix F – Guidelines for Traffic Impact StudiesSection F.6 When A Full Traffic Impact Study is Required2. Define the following study horizons for the Full Traffic Impact Study: the existing(current), short range, and long range horizons.a. Existing Horizon: The intent of the existing or current horizon is to establish abaseline traffic condition.b. Short Range Horizon: The intent of the short term horizon is to evaluate theimmediate impacts of the project on the transportation system. The shortterm horizon year is defined as the point of full buildout of the proposeddevelopment or land use action. If the project is proposed to occur overmultiple phases, the impacts shall be analyzed at the point of full buildout ofeach phase. In no case shall the short range horizon exceed five (5) years.c. Long Range Horizon: The intent of the long range planning horizon is toevaluate the impacts of the fully developed project in the context of regionaltransportation planning efforts. The long range impacts are analyzed as ofthe end of the current Regional Transportation Plan 20-year planning horizon.If no long range analysis year is established, the long range horizon shouldbe twenty years after the existing horizon.3. Identify the existing, committed (approved), and proposed land uses in the trafficimpact area.4. Prepare a map of transportation facilities within the traffic impact area for boththe short range and long range planning horizons including, but not limited to, allexisting and proposed roads, access points, and intersections. Includecommitted (funded) improvements by the County or by previously approveddevelopments or land use actions. This map should be used to graphicallydisplay average daily and peak hour traffic volumes for the existing, short range,and long range planning horizons.5. Describe existing traffic conditions within the traffic impact area, includingaverage daily traffic volumes for roadways and a.m. and p.m. peak hour volumesat intersections. These volumes must be based on traffic counts no more thantwo years old. Determine a.m. and p.m. peak hour levels of service forintersections.6. For short range traffic projections, provide references, calculations and datasources for all trip generation estimates, as follows. Use and document thefollowing procedures for all trip generation estimates:a. Obtain trip generation estimates or equations from the Institute ofTransportation Engineers (ITE), Trip Generation Manual. Where several tripgeneration rates are listed in ITE Trip Generation Manual, use the highest tripgeneration rate or provide sufficient justification for a lower rate.b. Where no published trip generation rates are available, the Engineer willconsider fully documented traffic volume counts for similar existing uses.c. Trip reduction factors may be applied under the following conditions:1) Basic requirements. Trip reduction factors may be applied to the full tripgeneration estimates derived from ITE rates or equations, only afterunderlying assumptions of the full ITE rates have been examined. All tripreduction factors must be fully quantified and justified in the Full TrafficImpact Study or its appendix.2) Reassigning generated trips to passby factor. Passby factor denotes tripsto the proposed development that currently exist as background mainlineLarimer County Rural Area Road Standards Page F-6October 22, 2007
Appendix F – Guidelines for Traffic Impact StudiesSection F.6 When A Full Traffic Impact Study is Requiredtraffic. Passby traffic must still be counted at site driveways and accesspoints, but can be taken out of the background mainline traffic. Passbyrates can be used from ITE Trip Generation Manual or othertransportation publications. The Full Traffic Study must clearly illustratere-diversion of the passby trips.3) Other adjustments to trip generation estimates. Adjustments may also betaken for internal site trips, transit use, and transportation demandmanagement strategies (TDM). Implementation proposals must be givenfor optimistic adjustments from transit use and TDM strategies. Suchproposals will become conditions of approval, and must be reasonablyexpected to occur within five years after site build-out.d. Show the results of the trip generation calculations in a matrix table with thefollowing information:1) Land use2) Unit of measurement (for example, per dwelling unit, per 1000 s.f., etc.)3) Total number of units4) Trip generation rates per unit for average daily traffic and peak hourvolumes5) Total number of trips generated for average daily traffic and a.m. and p.m.peak hours7. Short range and long range traffic projections must also include forecasts for thegrowth in background traffic. Growth rates must be approved during the scopingand may be based on one of the following (and clearly documented):a. Proportion between existing traffic volumes and projected volumes from theregional modelb. Extrapolation from historical countsc. Planning analysis which considers trends in the vicinity of the traffic impactarea either through a proportion or extrapolation estimate8. Provide trip distribution estimates for the roads and intersections in the trafficimpact area, and document the basis for these estimates. Assign the trafficbased on these trip distribution estimates for both short range and long rangeplanning horizons, graphically presented on the map described in Section D,above.9. Present the volumes for short range and long range traffic including the projectedtraffic for the proposed development or land use action for the a.m. and p.m.peak hour and average daily conditions. These volumes must include turnmovements at intersections as well as volumes for roads in the traffic impactarea.10. Analyze the adequacy of the transportation system to handle the projected trafficfor short range and long range planning years. Key elements in this analysisshould include:a. Generalized daily traffic volume level of service for roadwaysb. Intersection levels of service for a.m. and p.m. peak hoursLarimer County Rural Area Road Standards Page F-7October 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 112 and 113: Appendix D - Construction Standards
Page 130 and 131: APPENDIX E - CONSTRUCTION TESTING F
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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