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City of Henderson Department of Public Works Traffic Services Division Traffic Engineering To provide planning, design, design review, and Maintenance of City transportation infrastructure TRAFFIC IMPACT ANALYSIS GUIDELINES Traffic Impact Analysis Scope 1. A scope request must be submitted to the City for all new projects and updates regardless of the trip generation volumes. Generally, one intersection shall be analyzed for every 100 peak hour trips. For scoping purposes, the peak hour trips shall be calculated without any pass-by adjustments. The City may require additional intersections due to the location and nature of the development. Please fax TIA or TIA Update scope requests to (702) 267-3091. Email scope requests to PWTrafDataCollection@cityofhenderson.com. 2. The scope request must include trip generation volumes, vicinity map and a reduced site plan. The site plan to include at a minimum, any existing and proposed driveways, adjacent and opposing driveways, medians, drive aisles, and building footprints. A preliminary trip distribution is optional. The City encourages early review of the distribution to minimize review time of the study and to reduce the number of reviews. Traffic Impact Analysis A TIA is typically required on projects generating 100 peak hour trips or more for the entire proposed development. The City of Henderson (City) may require traffic studies, regardless of the number of trips generated by the development, as the City deems necessary due to the type of development proposed and the location. Updates will be required as different phases are built, regardless of the number of trips. 1. Trip Generation: Trip Generation should be calculated using the Institute of Transportation Engineers (I.T.E.) Trip Generation Manual, latest edition (See www.ite.org). In addition, Section 3.4 of the ITE Trip Generation Handbook titled Recommended Procedure for Estimating Trip Generation should be used. 2. Pass-By Trip Reductions: The following pass-by reductions will be allowed for traffic impact analyses. Pass-By Trip Reductions shall not be applied to driveway volumes. Reductions for diverted link trips and for uses other than those shown are not permitted. Unless otherwise shown, the pass-by reductions are for the weekday PM peak period. Land Use Free Standing Discount Superstore Free Standing Discount Store Hardware/Paint Store Shopping Center Shopping Center Sat Mid-day Tire Store Supermarket Convenience Market (Open 24 hours) Convenience Market with Gasoline Pumps AM Peak PWAD-0004 Rev. (12/11) Page 1 of 6 ITE Code 813 815 816 820 820 848 850 851 853 Pass-By Reduction 28% 17% 26% 34% 26% 28% 36% 61% 63% Primary Diverted 72% 83% 74% 66% 74% 72% 64% 39% 37% Department of Public Works Traffic Services 702-267-3099 Fax 702-267-3091 Convenience Market with Gasoline Pumps Discount Supermarket Home Improvement Superstore Pharmacy/Drugstore without Drive-Through Window Pharmacy Drugstore with Drive-Through Window Furniture Store Drive-In Bank Quality Restaurant High-Turnover (Sit-Down) Restaurant Fast-Food Restaurant with Drive-Through Window AM Peak Fast-Food Restaurant with Drive-Through Window Gasoline Service Station AM Peak Gasoline Service Station Gasoline Service Station with Convenience Market AM Peak Period Gasoline Service Station with Convenience Market 853 854 862 880 881 890 912 931 932 934 66% 23% 48% 53% 49% 53% 47% 44% 43% 49% 34% 77% 52% 47% 51% 47% 53% 56% 57% 51% 934 944 944 945 50% 58% 42% 62% 50% 42% 58% 38% 945 56% 44% 3. Mixed Use Projects: For mixed use projects of regional significance, internal capture rates shall be approved by the City Traffic Engineer or designee. 4. RTC Transit Routes: Provide a bus turnout on the far side of all 80’ x 80’ intersections and greater as a minimum. A combination bus turnout/right-turn lane may be required based upon review of the site plan. Other bus turnout locations will be reviewed on a case by case basis. 5. Level-of-Service Analysis: • Level-of-service calculations shall be based upon the latest edition of the Highway Capacity Manual. • If an intersection operates at a level-of-service below C (D or less), please provide and analyze three mitigation measures such as: signalization, channelized medians, turning lanes, increase in storage lanes, restricted turns, or additional lanes. Discuss the pros and cons of each as outlined in the RTC Policies and Procedures Manual. (See www.rtcsnv.com). If an intersection operates at level-of-service D or poorer with mitigation measures, the analysis still needs to be provided in the traffic study. Based upon the results of the analysis, the City will determine if any of the mitigation measures will be implemented. This information is needed in order to evaluate the impact on the overall roadway system in the area and adjacent neighborhoods. 6. Warrant Analysis: Signal warrant analysis shall be based upon the latest issue of the Manual on Uniform Traffic Control Devices (MUTCD). In general, the peak hour warrant shall not be used to warrant new traffic signals for typical commercial and residential land uses. The City may allow the use of projected volumes for warrant analysis provided the analysis shows projected 8 hour traffic signal warrants being satisfied. In addition to the Traffic Signal Warrant Analysis, provide progression analysis if a new or future signal is needed or recommended. If a new signal is proposed on a roadway being coordinated by the Freeway and Arterial System of Transportation (FAST), the proposed signal location will need to be submitted to FAST for their concurrence. 7. Progression Analysis: If a new signal is proposed on a roadway with existing or proposed traffic signal coordination performed by FAST, the proposed signal location and progression analysis will need to be submitted to FAST for their concurrence. Unless otherwise approved by the City, the arterial green band shall be a minimum of 40 percent of cycle length. PWAD-0004 Rev. (12/11) Page 1 of 6 Department of Public Works Traffic Services 702-267-3099 Fax 702-267-3091 8. Queuing Analysis: • Provide a queuing analysis at all project driveways in a gated community. • A 30 second service time per vehicle with one storage lane shall be used in the analysis. A separate visitor lane and turn-around area will need to be provided per RTC Standard Drawing No. 222A. • A left turn lane and/or right turn lane at the project entrance shall not be included as part of the storage distance. • The available queuing distance shall be a minimum of 50 feet measured from the back of curb to the visitor call box. • Methodology from the ITE Transportation and Land Development publication shall be used. (See www.ite.org). 9. Left/Right Turn Storage Analysis: Left-turn and right-turn storage bay analyses must be performed at all study intersections and project driveways identified in the traffic impact analysis scope. Storage at signalized intersections is to be calculated using the Poisson method with 95 percent confidence and a 3 minute wait. Right turn lane storage may be calculated as shown in the ITE Transportation and Land Development publication. (See www.ite.org). Storage at unsignalized intersections is to be calculated assuming a uniform arrival rate with a 2 minute wait. 10. Intersections of 80 ft and 100 ft Streets: Additional rights of way for dual left turn lanes and right turn lanes are required for all intersections of 80 ft and greater per RTC Standard Drawing 201.1. (See www.rtcsnv.com). Right of way for intersection flaring may also be required at any intersection as determined by the Public Works Director or designee. 11. Driveways: • Common driveways shall be required between developing parcels with similar uses proposed. Exceptions to this requirement must be approved by the Director of Public Works and / or the Community Development Director. (See Henderson Development Code Section 19.10.1N6f) • No more than two driveways shall be allowed along the property frontage of any street. If the driveway spacing cannot be met, then only one drive will be allowed. Additional driveways shall require approval from the Director of Public Works. (See Henderson Development Code Section 19.10.1N6g) • Except for the DCC zoning district, driveways into commercial, business park, office complex and warehouse developments that generate more than 500 vehicle trips per day shall be spaced 200 feet centerline to centerline for driveways accessing 80-foot-wide right of way streets and 300 feet centerline to centerline for driveways accessing 100-foot-wide and greater right-of-way streets. Driveways in the DCC zoning district shall be approved by design review. (See Henderson Development Code Section 19.10.1N6h) 12. Cost Participation Analysis / Critical Lane Analysis: • Use 66.6% (2/3) for 2 lanes and 50% (1/2) for 3 or more lanes in calculating the critical lane for multilane facilities. Use 55.5% for dual left turn lanes or dual right turn lanes. • Use 1200 vehicles per hour as the critical lane volume at intersections and 1,140 per hour at T intersections. The current cost of a signal is approximately $275,000 for intersections of City roadways and $300,000 on state roadways. The cost is subject to change by the City based upon actual bid prices. • If left turn volumes exceed 300 vehicles per hour, dual lefts may be required. Participation for dual lefts is computed using a 300 vehicle per hour capacity. The current cost for dualleft turns is approximately $150,000. PWAD-0004 Rev. (12/11) Page 2 of 6 Department of Public Works Traffic Services 702-267-3099 Fax 702-267-3091 • • • For streets 100 feet wide or greater, right-turn lanes may be required for driveways that are projected to have 50 to 99 entering vehicles during the peak hour and right turn lanes will be required for all driveways that are projected to have 100 entering vehicles or more during the development’s peak hour. For streets 80 feet in width, right-turn lanes will be required at driveways that are projected to have 100 entering vehicles or more during the peak hour. If right-turn volumes exceed 150 vehicles per hour at an intersection, a right turn lane may be required. Right turn lanes may also be required as determined by the Director of Public Works. Right turn lanes shall not be required for driveways in the DCC zoning district. The current cost for right turn lanes is approximately $150,000. A capacity of 150 vehicles per hour should be used for participation calculations for intersections. Use existing lane configurations in the analysis and what is committed to be built by the developer. It may be acceptable to use additional lanes if a project is under construction. When projects are built in phases, the study will address the improvements to be constructed with each phase and the associated participation for each phase. 13. Traffic Accident Analysis: The intersections and mid-block locations to be analyzed shall be specified in the TIA scope. Accident data is to be supplied by the City of Henderson police. In general, an accident analysis shall include the number of accidents and an accident rate. Accident rates shall be calculated per million vehicle miles for segments and per million entering vehicles for intersections. Traffic and pedestrian accident data including a minimum period of 3 years shall be evaluated at intersections, median openings and mid-block as required in the scope. The estimated increase or decrease of accident potential is to be analyzed and mitigation measures recommended. 14. Figures to be included in the Traffic Impact Analysis: • Vicinity Map. • Site Plan Map. • Directional Distribution. • Existing traffic volumes. • Peak Hour Site Only Volumes. • Future Background Traffic Volumes. • Future Background With Site Traffic Volumes. • Existing Geometrics and Control. • Recommended Geometrics and Control. • School Walking Routes for Residential Developments. • Site Plan or Project Boundary Superimposed on Aerial Photograph. • Time-Space Diagrams for traffic signal progression, if applicable. 15. Additional Items to be Included in the Traffic Impact Analysis: • Traffic Impact Analysis Scoping Checklist. • Planning Commission and City Council Conditions. • 24”x36” and 11”x17” site plans showing, at a minimum, building with square footages, drive aisles, street names (public and private), medians, right-of-way, opposing/adjacent driveways, and gated entries. • Completed Traffic Impact Analysis Submittal Form. • Statement of Conformance to NDOT’s Access Management System and Standards, if applicable. See (www.nevadadot.com/business/forms/pdfs/TrafEng_AccesMgtSysStandards.pdf). 16. Submittal Fees: Submittal Fees will need to be paid at the time of initial submittal. The fees are shown in the table below and were effective May 2, 2005. PWAD-0004 Rev. (12/11) Page 3 of 6 Department of Public Works Traffic Services 702-267-3099 Fax 702-267-3091 Type of Submittal Traffic Impact Analysis (acreage < 5) Traffic Impact Analysis (5< acreage < 40) Traffic Impact Analysis (40