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A. Purpose: Traffic studies are required by Churchill County to adequately assess the impact of a proposed development on the existing and/or planned highway system. The developer will have the primary responsibility for assessing the traffic impacts associated with a proposed development, with the County serving in a review and approval capacity.
B. Traffic Impact Study Requirements:
1. Developments that generate eighty (80) or more peak hour weekday trips or five hundred (500) average daily traffic (ADT) as determined by the current edition of the Institute of Transportation Engineers (ITE) "Trip Generation Manual".
2. Developments that generate less than eighty (80) peak hour weekday trips or five hundred (500) average daily traffic (ADT) and deemed to have impacts to safety, the neighborhood, intersection capacity, high accident areas, traffic circulation, or other concerns identified by the County or NDOT.
3. Phased developments that generate over eighty (80) peak hour weekday trips or five hundred (500) average daily traffic (ADT) when including traffic from all phases, or at the discretion of the County.
C. General Provisions:
1. The traffic engineering consultant is required to contact the County to define and obtain approval of the traffic study area limits.
2. The traffic study will be the responsibility of the applicant and must be prepared and sealed by a Nevada licensed engineer who has expertise in traffic studies and transportation planning.
3. Upon receipt of a draft traffic study, the County Engineer and Road Department will review the study data (sources, methods and findings) and will respond with written comments. The developer and engineer will then have an opportunity to incorporate necessary revisions prior to submitting a final report. The County Engineer then must approve the final report before an application will be accepted.
4. All previous traffic studies that are more than two (2) years old at the time that construction commences on the project will require updating. This may be waived if conditions have not significantly changed.
5. Traffic counts that are over one year old cannot be used in the traffic study, unless prior approval is given by the County.
6. The County must approve the development's trip generation, trip distribution, pass-by rates, internal capture rates, and the methods used to establish a buildout condition, prior to the traffic study submittal.
7. In the case of jurisdictional overlap, the applicant's traffic engineering consultant should meet with other appropriate jurisdictions, such as NDOT, to define the scope of the project. The applicant will have to satisfy the requirements of all jurisdictions involved in reviewing the traffic study.
D. Traffic Study Report Format: The following format represents the minimum information to be included in the traffic impact study.
1. Executive Summary: This will contain a brief project description and concise description of the study findings.
a. Project description.
b. Site location.
c. Study area boundaries.
3. Existing Conditions:
a. Adjacent and study roadway description: Describe study roadways including noting bus routes, bike lanes, on street parking, functional class, jurisdiction, shoulder types, median type, speed limits, etc.
b. Study intersection description: Describe study intersections including control type, pedestrian control, jurisdiction, etc.
c. Current zoning: Call out the existing zoning of the project and adjacent parcels.
d. Existing intersection volumes (peak hour): Show the existing peak hour traffic count volumes at study intersections.
e. Existing roadway volumes (daily volumes): Show the existing daily traffic volumes, if available, at study road segments.
f. Existing intersection and roadway level of service:
(1) Perform intersection and roadway level of service analyses as found in the most current version of the "Highway Capacity Manual".
(2) State or show the existing vehicle queue lengths at study intersections or driveways.
g. Existing accident data: High accident intersections or road segments should be noted when accident data is available. The cause of these high accident locations should also be investigated and included in the report, when accident data is available.
4. Site Plan Analysis:
a. Site plan:
(1) Provide a scaled drawing of the site plan as analyzed in this traffic study. Include building and parking locations and note on the site plan the land uses of adjacent parcels.
b. Access spacing:
(1) The current county access spacing standards should be followed or, with county approval, consult AASHTO's "A Policy On Geometric Design Of Highways And Streets".
(2) Show the location of project driveways and all other accesses both adjacent to and on the opposite side of the roadway.
(3) Clearly identify secondary or emergency accesses and state if they are gated, unrestricted, shared by other properties, and are temporary. Approval from the fire department is required.
c. Traffic circulation:
(1) Review the site plan for general traffic circulation such as on site vehicle queuing and ease of access.
(2) Access points expected to be used by service vehicles shall have turning paths sufficient to allow service vehicles to enter and exit the site without encroaching upon opposing lanes, curbed areas or unpaved areas.
d. Pedestrian circulation:
(1) Review the site plan for pedestrian flow, adequacy, and safety.
5. Project Conditions:
a. Project Vehicle Trip Generation:
(1) Project vehicle trips shall be estimated using the methodologies found in the most current version of the following Institute of Transportation Engineers (ITE) publications:
"Trip Generation Manual" - estimating project vehicle trips.
"Trip Generation Handbook" - estimating pass-by and internal trips.
ITE articles and other publications - estimating trips for nontypical projects.
(2) The county may require specific trip generation rates to be used in specific cases that differ from the ITE average values when the results of local studies differ from the national values. If ITE values are not available for the proposed land use, a local trip generation study may be performed at comparable land uses.
(3) Trip generation should include the following:
Average daily traffic (ADT).
A.M. peak hour trips (in and out).
P.M. peak hour trips (in and out).
Pass-by or diverted trips if applicable (when applicable).
Internal capture rates for large multi-use projects.
(4) The county must approve the project trip generation prior to submittal of the traffic study.
b. Trip Distribution And Assignment:
(1) Project traffic is to be distributed to the road network based on existing traffic counts, proximity to major roadways, and engineering judgment. Project traffic is to be shown separate from background and other traffic.
(2) The county must approve the project trip distribution before submittal of the traffic study.
6. Existing Plus Project Conditions: Combine the existing background traffic with the estimated project traffic and perform a traffic impact and capacity analysis of the site traffic on the existing road network.
a. Existing plus project intersection volumes (peak hour):
(1) Show the combined existing plus project peak hour traffic volumes at study intersections.
b. Existing plus project roadway volumes (daily volumes):
(1) Show the combined existing plus project daily traffic volumes at study road segments.
(2) All roadways must maintain level of service per the direction of the most current version of the county's adopted long range transportation plan. Currently, LOS C or better is acceptable.
c. Existing plus project intersection and roadway level of service:
(1) Perform a combined existing plus project intersection and roadway level of service analysis as found in the most current version of the "Highway Capacity Manual".
(2) State or show the estimated changes in queue lengths when adding project traffic to existing traffic queue lengths at the study intersections or driveways.
(3) All intersections must maintain a level of service per the direction in the most current version of the county's adopted long range transportation plan. Currently, LOS C or better is acceptable.
7. Existing Plus Project With Mitigation:
a. When intersections or roadways fall below an LOS C, mitigation measures are to be analyzed and presented here.
b. Other mitigation measures such as unacceptable vehicle queues and poor circulation are to be presented here.
c. When signalization is required to mitigate project traffic effects, a signal warrant analysis needs to be provided. The methodologies for signal warrants found in the "Manual On Uniform Traffic Control Devices" (MUTCD) are to be used.
8. Buildout Condition:
a. This scenario is to represent the project at full buildout including background traffic growth over the life of the project.
b. Level of service analyses are to be performed and presented here as in previous sections of the report.
9. Cumulative/Future Condition:
a. This scenario is to represent a twenty (20) year horizon and help in determining how the proposed projects fit into the long range planning efforts of the county. Traffic volumes for this condition can be estimated using long range transportation models, NDOT growth projections, growth factors, or a travel demand model. It is recommended to consult the county to determine available data and acceptable methodologies.
b. Include road or other infrastructure projects that are approved or planned as detailed in Churchill County's long range transportation planning documents.
c. Show road segment level of service or capacity levels as detailed in the most current Churchill County transportation plan or other jurisdictions' documents.
a. All conclusions and recommendations are to be detailed here in a clear and concise format. Figures may be included to show recommended improvements or mitigations.
1. All raw traffic count data, including hourly, average daily traffic (ADT), turning movements, and peak hour counts, and analysis worksheets shall be provided in appendices. Traffic analysis computer programs and printouts may be used as part of the report.
2. Figures can be included within each of their respective sections or included in the front of the appendix. (Bill 2018-E, 2019: Bill 2005-F § 2.2, 2005)