Axle and Length Classification Factor Analysis and Effects on Annual Average Daily Traffic (AADT)

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General Information
Study Number: TPF-5(340)
Lead Organization: Wisconsin Department of Transportation
Solicitation Number: 1418
Partners: GADOT, IADOT, ID, IL, KS, MN, ND, NY, OH, PADOT, TX, UT, WI
Status: Closed
Est. Completion Date: Jun 07, 2019
Contract/Other Number:
Last Updated: Jun 09, 2020
Contract End Date: Jun 07, 2019
Financial Summary
Contract Amount:
Total Commitments Received: $262,500.00
100% SP&R Approval: Approved
Contact Information
Lead Study Contact(s): Ethan Severson
ethanp.severson@dot.wi.gov
Phone: 608-266-1457
FHWA Technical Liaison(s): Steven Jessberger
Steven.Jessberger@dot.gov
Phone: 202-366-5052
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Georgia Department of Transportation 2016 $12,500.00 Shronica Holland Supriya Kamatkar 404-347-0552 skamatkar@dot.ga.gov
Idaho Department of Transportation 2016 $12,500.00 Vicky Calderon Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Idaho Department of Transportation 2018 $12,500.00 Vicky Calderon Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Illinois Department of Transportation 2016 $12,500.00 William Morgan Megan Swanson 217-782-3547 Megan.Swanson@illinois.gov
Iowa Department of Transportation 2017 $12,500.00 Mark Hansen Cheryl Cowie 515-239-1447 Cheryl.Cowie@iowadot.us
Kansas Department of Transportation 2016 $12,500.00 Bill Hughes David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2018 $12,500.00 Bill Hughes David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Minnesota Department of Transportation 2016 $12,500.00 Gene Hicks Lisa Jansen 651-366-3779 lisa.jansen@state.mn.us
Minnesota Department of Transportation 2018 $12,500.00 Gene Hicks Lisa Jansen 651-366-3779 lisa.jansen@state.mn.us
New York State Department of Transportation 2016 $12,500.00 Andrew Haynes Wes Yang 518-457-4660 wes.yang@dot.ny.gov
North Dakota Department of Transportation 2016 $12,500.00 Ethan Akerly Amy Beise 701-328-6921 abeise@nd.gov
North Dakota Department of Transportation 2017 $0.00 Ethan Akerly Amy Beise 701-328-6921 abeise@nd.gov
North Dakota Department of Transportation 2018 $12,500.00 Ethan Akerly Amy Beise 701-328-6921 abeise@nd.gov
Ohio Department of Transportation 2016 $12,500.00 Dave Gardner Cynthia Jones 614-466-1975 cynthia.jones@dot.ohio.gov
Ohio Department of Transportation 2018 $12,500.00 Dave Gardner Cynthia Jones 614-466-1975 cynthia.jones@dot.ohio.gov
Pennsylvania Department of Transportation 2016 $12,500.00 Jeremy Freeland Heather Sorce 717-214-9508 hsorce@pa.gov
Texas Department of Transportation 2016 $12,500.00 Bill Knowles Ned Mattila 512-416-4727 ned.mattila@txdot.gov
Texas Department of Transportation 2018 $12,500.00 Bill Knowles Ned Mattila 512-416-4727 ned.mattila@txdot.gov
Utah Department of Transportation 2016 $12,500.00 Todd Hadden David Stevens 801-589-8340 davidstevens@utah.gov
Utah Department of Transportation 2018 $12,500.00 Todd Hadden David Stevens 801-589-8340 davidstevens@utah.gov
Wisconsin Department of Transportation 2016 $12,500.00 Russell Lewis Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov
Wisconsin Department of Transportation 2017 $12,500.00 Russell Lewis Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov

Study Description

State DOTs face ongoing challenges to ensure quality and soundness of traffic data. The multitude of traffic count equipment/software on the market, data collection best practices, number of length bins, and data processing hurdles are the usual topics talked about when discussing data quality.

Axle factors are used to estimate annual average daily traffic (AADT) volume. Classification and length sites are used to determine axle factors. To fully understand the relationship of classification versus length data when generating axle factors will require analysis of millions of traffic records.

The Wisconsin DOT is leading a pooled fund to utilize resources and expertise to research and analyze the complex issue of how length-based data affects axle factoring and leverage more cost-effective traffic data collection methods to support factor generation.

Wisconsin has completed an initial study on this topic with High Desert Traffic that provides a foundation to build upon. The Wisconsin study also examined the use of individual vehicle records to calculate updated average axles for each length classification binning scheme used. This study continued the ground work done in the TPF 5-192 Minnesota DOT led pooled-fund program to address the multifaceted issues of developing reliable axle factors from length-based classification data.

Participation in this pooled fund presents opportunity for partner agencies to take advantage of a wide range of expertise in axle and length classification traffic data and factor generation analysis to ensure their programs are efficient, cost effective, and provide sound traffic data.

Objectives

1. Assemble State DOTs and industry experts to conduct research and statistical analysis on millions of traffic data records in order to provide guidance and understanding on the variability of how axle and length classification data affect AADT, specifically with regard to the creation of axle factors.

2. Gain a quantitative understanding on how length classification traffic data affects the calculation of AADT. Length classification sites are more cost effective than axle classification sites from installation to maintenance. This objective will allow State DOTs to fully understand the statistical significance and soundness when using this cost-effective data collection option.

3. Gain a quantitative understanding of how axle and length classification traffic data interact and affect the calculation of AADT. State DOTs that have both these types of continuous classification traffic site installations or State DOTs who are considering including the lesser expensive length classification sites to their continuous program will understand advantages and distinctions of utilizing these combined data sources.

Organizational Structure

TECHNICAL COMMITTEE – State Department of Transportation Agencies

Lead State – Wisconsin DOT

• Agency proposing the pooled fund

• Act as the sponsoring agency

• Receive invoices from the selected vendor

• Assist in soliciting new pooled fund partners

Participating States

• Review, comment on, and recommend for approval all project proposals generated through their participation on the Technical Committee

• Make final decisions of the approval of any project proposal

• Participating states, including the lead state, will have one vote on the Technical Committee

Selected Vendor

• Prepare invoices to be sent to Wisconsin DOT for research activities

• Plan, coordinate, and facilitate meetings of the Technical Committee using teleconferencing and other available technologies, as well as face-to-face meetings

• Prepare draft proposals that include work plans and budgets to be presented to the Technical Committee for review, comment, and approval

• Prepare quarterly reports to be submitted to the Technical Committee and the Wisconsin DOT

Scope of Work

PARTICIPATING MEMBERS

1. Each project partner will review project implementation to make sure project outputs will be useful

2. Review project methodology and provide feedback

3. Selected States will provide traffic data for statistical analysis

4. Participate in quarterly teleconference or scheduled face-to-face meeting

5. Provide timely review of quarterly and final report

VENDOR/CONSULTANT

1. Identify current literature on axle and length classification data collection characteristics

2. Identify strengths and weaknesses from data quality, usage, and monetary standpoint

3. Outline method to collect data for the project and any processing concerns

4. Review participating State DOT traffic programs to select pilot states

5. Identify sample size possibly 3-5 states that will provide confidence in outcomes

6. Conduct statistical analysis and compile draft summary findings

7. Produce quarterly and final reports

PROJECT SCHEDULE - Begin and Complete Dates TBD

1. Select Vendor and Award Contract

2. Identify Current Literature on Axle & Length

3. Outline Method to Collect Data and Considerations

4. Select Participating State DOT Pilot States

5. Identify and Agree on Sample Size

6. Conduct Statistical Analysis and Compile Draft Findings

7. Produce Quarterly and Final Reports

Commitment

• Sponsoring Agency: Wisconsin Department of Transportation

• Lead State Agency: Wisconsin DOT

• Commitments Required: $125,000 - $150,000

• Minimum State Commitment: $12,500 per year

• Commitment Start Year: FFY 2016

• Duration: maximum of 14 months

Comments

A waiver of the non-federal match requirement for SPR funding has been requested and approved.

Documents Attached
Title File/Link Type Privacy Download
Final Report Phase 1: Viability of Vehicle Length in Estimating Vehicle Classification and Axle Factors Final Report - Viability of Vehicle Length in Estimating Vehicle Class1.pdf Final Report Public
Final Report Phase 2: Viability of Vehicle Length in Estimating Vehicle Classification and Axle Factors Final Report_Phase II_190516.pdf Final Report Public
Approved Waiver Approval of SP&R Waiver Pooled Fund Solicitation #1418.pdf Memorandum Public
Acceptance Memo TPF-5(340) acceptance memo.pdf Memorandum Public
Waiver Request Waiver Request Letter - Solicitation #1418.pdf Other Public
Axle Factor Conversion User Guide Axle Factor Conversion User Guide_Final.pdf Other Public
Q2 2016 Report QPR-2016Q2-Axle-Length Factors.doc Quarterly Progress Report Public
Q3 2016 Report QPR-2016Q3-Axle-Length Factors.doc Quarterly Progress Report Public
Q4 2016 Report QPR-2016Q4-Axle-Length Factors.doc Quarterly Progress Report Public
Q1 2017 Report QPR-2017Q1-Axle-Length Factors.pdf Quarterly Progress Report Public
Q2 2017 Report QPR-2017Q2-Axle-Length Factors.doc Quarterly Progress Report Public
Q3 2017 Report QPR-2017Q3-Axle-Length Factors.doc Quarterly Progress Report Public
Q4 2017 Report QPR-2017Q4-Axle-Length Factors.doc Quarterly Progress Report Public
Q1 2018 Report QPR-2018Q1-Axle-Length Factors.doc Quarterly Progress Report Public
Q2 2018 Report QPR-2018Q2-Axle-Length Factors.doc Quarterly Progress Report Public
Q3 2018 Report QPR-2018Q3-Axle-Length Factors.doc Quarterly Progress Report Public
Q4 2018 Report QPR-2018Q4-Axle-Length Factors.doc Quarterly Progress Report Public
Q1 2019 Report QPR-2019Q1-Axle-Length Factors.doc Quarterly Progress Report Public
Phase 2 Scope of Work Axle Factor TPF Phase 2 Enhanced_20171002 - Copy.pdf Work Plan Public

Axle and Length Classification Factor Analysis and Effects on Annual Average Daily Traffic (AADT)

General Information
Study Number: TPF-5(340)
Lead Organization: Wisconsin Department of Transportation
Solicitation Number: 1418
Partners: GADOT, IADOT, ID, IL, KS, MN, ND, NY, OH, PADOT, TX, UT, WI
Status: Closed
Est. Completion Date: Jun 07, 2019
Contract/Other Number:
Last Updated: Jun 09, 2020
Contract End Date: Jun 07, 2019
Financial Summary
Contract Amount:
Total Commitments Received: $262,500.00
100% SP&R Approval:
Contact Information
Lead Study Contact(s): Ethan Severson
ethanp.severson@dot.wi.gov
Phone: 608-266-1457
FHWA Technical Liaison(s): Steven Jessberger
Steven.Jessberger@dot.gov
Phone: 202-366-5052
Commitments by Organizations
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Georgia Department of Transportation 2016 $12,500.00 Shronica Holland Supriya Kamatkar 404-347-0552 skamatkar@dot.ga.gov
Idaho Department of Transportation 2016 $12,500.00 Vicky Calderon Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Idaho Department of Transportation 2018 $12,500.00 Vicky Calderon Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Illinois Department of Transportation 2016 $12,500.00 William Morgan Megan Swanson 217-782-3547 Megan.Swanson@illinois.gov
Iowa Department of Transportation 2017 $12,500.00 Mark Hansen Cheryl Cowie 515-239-1447 Cheryl.Cowie@iowadot.us
Kansas Department of Transportation 2016 $12,500.00 Bill Hughes David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Kansas Department of Transportation 2018 $12,500.00 Bill Hughes David Behzadpour 785-291-3847 David.Behzadpour@ks.gov
Minnesota Department of Transportation 2016 $12,500.00 Gene Hicks Lisa Jansen 651-366-3779 lisa.jansen@state.mn.us
Minnesota Department of Transportation 2018 $12,500.00 Gene Hicks Lisa Jansen 651-366-3779 lisa.jansen@state.mn.us
New York State Department of Transportation 2016 $12,500.00 Andrew Haynes Wes Yang 518-457-4660 wes.yang@dot.ny.gov
North Dakota Department of Transportation 2016 $12,500.00 Ethan Akerly Amy Beise 701-328-6921 abeise@nd.gov
North Dakota Department of Transportation 2017 $0.00 Ethan Akerly Amy Beise 701-328-6921 abeise@nd.gov
North Dakota Department of Transportation 2018 $12,500.00 Ethan Akerly Amy Beise 701-328-6921 abeise@nd.gov
Ohio Department of Transportation 2016 $12,500.00 Dave Gardner Cynthia Jones 614-466-1975 cynthia.jones@dot.ohio.gov
Ohio Department of Transportation 2018 $12,500.00 Dave Gardner Cynthia Jones 614-466-1975 cynthia.jones@dot.ohio.gov
Pennsylvania Department of Transportation 2016 $12,500.00 Jeremy Freeland Heather Sorce 717-214-9508 hsorce@pa.gov
Texas Department of Transportation 2016 $12,500.00 Bill Knowles Ned Mattila 512-416-4727 ned.mattila@txdot.gov
Texas Department of Transportation 2018 $12,500.00 Bill Knowles Ned Mattila 512-416-4727 ned.mattila@txdot.gov
Utah Department of Transportation 2016 $12,500.00 Todd Hadden David Stevens 801-589-8340 davidstevens@utah.gov
Utah Department of Transportation 2018 $12,500.00 Todd Hadden David Stevens 801-589-8340 davidstevens@utah.gov
Wisconsin Department of Transportation 2016 $12,500.00 Russell Lewis Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov
Wisconsin Department of Transportation 2017 $12,500.00 Russell Lewis Lynn Hanus 608-267-2294 lynnm.hanus@dot.wi.gov

Study Description

Study Description

State DOTs face ongoing challenges to ensure quality and soundness of traffic data. The multitude of traffic count equipment/software on the market, data collection best practices, number of length bins, and data processing hurdles are the usual topics talked about when discussing data quality.

Axle factors are used to estimate annual average daily traffic (AADT) volume. Classification and length sites are used to determine axle factors. To fully understand the relationship of classification versus length data when generating axle factors will require analysis of millions of traffic records.

The Wisconsin DOT is leading a pooled fund to utilize resources and expertise to research and analyze the complex issue of how length-based data affects axle factoring and leverage more cost-effective traffic data collection methods to support factor generation.

Wisconsin has completed an initial study on this topic with High Desert Traffic that provides a foundation to build upon. The Wisconsin study also examined the use of individual vehicle records to calculate updated average axles for each length classification binning scheme used. This study continued the ground work done in the TPF 5-192 Minnesota DOT led pooled-fund program to address the multifaceted issues of developing reliable axle factors from length-based classification data.

Participation in this pooled fund presents opportunity for partner agencies to take advantage of a wide range of expertise in axle and length classification traffic data and factor generation analysis to ensure their programs are efficient, cost effective, and provide sound traffic data.

Objectives

1. Assemble State DOTs and industry experts to conduct research and statistical analysis on millions of traffic data records in order to provide guidance and understanding on the variability of how axle and length classification data affect AADT, specifically with regard to the creation of axle factors.

2. Gain a quantitative understanding on how length classification traffic data affects the calculation of AADT. Length classification sites are more cost effective than axle classification sites from installation to maintenance. This objective will allow State DOTs to fully understand the statistical significance and soundness when using this cost-effective data collection option.

3. Gain a quantitative understanding of how axle and length classification traffic data interact and affect the calculation of AADT. State DOTs that have both these types of continuous classification traffic site installations or State DOTs who are considering including the lesser expensive length classification sites to their continuous program will understand advantages and distinctions of utilizing these combined data sources.

Organizational Structure

TECHNICAL COMMITTEE – State Department of Transportation Agencies

Lead State – Wisconsin DOT

• Agency proposing the pooled fund

• Act as the sponsoring agency

• Receive invoices from the selected vendor

• Assist in soliciting new pooled fund partners

Participating States

• Review, comment on, and recommend for approval all project proposals generated through their participation on the Technical Committee

• Make final decisions of the approval of any project proposal

• Participating states, including the lead state, will have one vote on the Technical Committee

Selected Vendor

• Prepare invoices to be sent to Wisconsin DOT for research activities

• Plan, coordinate, and facilitate meetings of the Technical Committee using teleconferencing and other available technologies, as well as face-to-face meetings

• Prepare draft proposals that include work plans and budgets to be presented to the Technical Committee for review, comment, and approval

• Prepare quarterly reports to be submitted to the Technical Committee and the Wisconsin DOT

Scope of Work

PARTICIPATING MEMBERS

1. Each project partner will review project implementation to make sure project outputs will be useful

2. Review project methodology and provide feedback

3. Selected States will provide traffic data for statistical analysis

4. Participate in quarterly teleconference or scheduled face-to-face meeting

5. Provide timely review of quarterly and final report

VENDOR/CONSULTANT

1. Identify current literature on axle and length classification data collection characteristics

2. Identify strengths and weaknesses from data quality, usage, and monetary standpoint

3. Outline method to collect data for the project and any processing concerns

4. Review participating State DOT traffic programs to select pilot states

5. Identify sample size possibly 3-5 states that will provide confidence in outcomes

6. Conduct statistical analysis and compile draft summary findings

7. Produce quarterly and final reports

PROJECT SCHEDULE - Begin and Complete Dates TBD

1. Select Vendor and Award Contract

2. Identify Current Literature on Axle & Length

3. Outline Method to Collect Data and Considerations

4. Select Participating State DOT Pilot States

5. Identify and Agree on Sample Size

6. Conduct Statistical Analysis and Compile Draft Findings

7. Produce Quarterly and Final Reports

Commitment

• Sponsoring Agency: Wisconsin Department of Transportation

• Lead State Agency: Wisconsin DOT

• Commitments Required: $125,000 - $150,000

• Minimum State Commitment: $12,500 per year

• Commitment Start Year: FFY 2016

• Duration: maximum of 14 months

Comments

A waiver of the non-federal match requirement for SPR funding has been requested and approved.

Title File/Link Type Private
Final Report Phase 1: Viability of Vehicle Length in Estimating Vehicle Classification and Axle Factors Final Report - Viability of Vehicle Length in Estimating Vehicle Class1.pdf Final Report Public
Final Report Phase 2: Viability of Vehicle Length in Estimating Vehicle Classification and Axle Factors Final Report_Phase II_190516.pdf Final Report Public
Approved Waiver Approval of SP&R Waiver Pooled Fund Solicitation #1418.pdf Memorandum Public
Acceptance Memo TPF-5(340) acceptance memo.pdf Memorandum Public
Waiver Request Waiver Request Letter - Solicitation #1418.pdf Other Public
Axle Factor Conversion User Guide Axle Factor Conversion User Guide_Final.pdf Other Public
Q2 2016 Report QPR-2016Q2-Axle-Length Factors.doc Quarterly Progress Report Public
Q3 2016 Report QPR-2016Q3-Axle-Length Factors.doc Quarterly Progress Report Public
Q4 2016 Report QPR-2016Q4-Axle-Length Factors.doc Quarterly Progress Report Public
Q1 2017 Report QPR-2017Q1-Axle-Length Factors.pdf Quarterly Progress Report Public
Q2 2017 Report QPR-2017Q2-Axle-Length Factors.doc Quarterly Progress Report Public
Q3 2017 Report QPR-2017Q3-Axle-Length Factors.doc Quarterly Progress Report Public
Q4 2017 Report QPR-2017Q4-Axle-Length Factors.doc Quarterly Progress Report Public
Q1 2018 Report QPR-2018Q1-Axle-Length Factors.doc Quarterly Progress Report Public
Q2 2018 Report QPR-2018Q2-Axle-Length Factors.doc Quarterly Progress Report Public
Q3 2018 Report QPR-2018Q3-Axle-Length Factors.doc Quarterly Progress Report Public
Q4 2018 Report QPR-2018Q4-Axle-Length Factors.doc Quarterly Progress Report Public
Q1 2019 Report QPR-2019Q1-Axle-Length Factors.doc Quarterly Progress Report Public
Phase 2 Scope of Work Axle Factor TPF Phase 2 Enhanced_20171002 - Copy.pdf Work Plan Public

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