Analysis Procedures Manual

The Analysis Procedures Manual, or APM, provides the current methodologies, practices and procedures for conducting long term analysis of Oregon Department of Transportation plans and projects.

The APM does not establish any accepted or preferred software. Any analysis software is acceptable as long as it is consistent with the current APM and Highway Capacity Manual.

APM Version 2

Analysis Procedures Manual Version 2 - All Chapters - 19MB
(Last updated: 02/19/2025)

The APM file has been updated to include a clickable Table of Contents, a smaller overall file size, and is now viewable in most browsers for an easier reading experience. (It is still a large file and may take time to load.)

You may also explore individual chapters below.

Cover (Last updated: 02/19/2025)

Acknowledgements (Last updated: 02/19/2025)

Preface (Last updated: 04/06/2023)

Chapter 1 (Last updated: 08/21/2024)

Appendix 1A - ODOT Traffic Engineering Authority
(Last updated: 06/23/2017)

Chapter 2 - Scoping Projects (Last updated: 05/17/2022)

Appendix 2A - Problem Statement Worksheet
(Last updated: 06/19/2014)

Chapter 3 - Transportation System Inventory
(Last updated: 03/01/2024)

Appendix 3A - Field Inventory Worksheet
(Last updated: 07/26/2017)
Appendix 3B - Sample Count Request and Sample ODOT Counts
(Last updated: 03/01/2024)
Appendix 3C - Oregon Traffic Counting Management System (OTMS) Program Count Report Guide
(Last updated: 11/18/2022)
Appendix 3D - Saturation Flow Rate Data Collection Form
(Last updated: 06/26/2017)
Appendix 3E - Traffic Volume Development During Disruptive Events
(Last updated: 06/08/2022)

Chapter 4 - Safety (Last updated: 9/22/2019)

Appendix 4A - Crash Attribution and Automation
(Last updated: 06/08/2022)

Chapter 5 - Developing Existing Year Volumes
(Last updated: 11/18/2022)

Chapter 6 - Future Year Forecasting
(Last updated: 06/08/2022)

Appendix 6A - Sample Application of Enhanced Zonal Cumulative Analysis (Last updated: 06/26/2017)
Appendix 6B - Considering Connected and Automated Vehicles in Future-Year Roadway Capacity Forecasts (Last updated: 09/26/2023)
Appendix 6C - Supplemental Guidance on Connected and Automated Vehicle Analyses (Last updated: 09/26/2023)

Chapter 7 - System Planning Analysis (Last updated: 08/23/2023)

Chapter 8 - Mesoscopic Analysis (Last updated: 07/19/2018)

Appendix 8A - Peak Spreading Procedure
(Last updated: 06/26/2017)
Appendix 8B - PTV Vision Software Network Setup Guide
(Last updated: 06/26/2017)

Chapter 9 - Transportation Analysis Performance Measures
(Last updated: 03/16/2020)

Appendix 9A - Applicability of Analysis Performance Measures by Plan or Project Type
(Last updated: 01/04/2018)
Appendix 9B - Alternative Mobility Targets (Planning Business Line Team Operational Notice)
(Last updated: 04/12/2018)

Chapter 10 - Analyzing Alternatives (Last updated: 06/08/2022)

Appendix 10A - Auxiliary Lanes (Last Updated: 08/23/2023)

Chapter 11 - Segment and Facility Analysis
(Last updated: 08/23/2023)

Appendix 11A - Determining Free-Flow Speed
(Last updated: 10/29/2018)
Appendix 11B - Freeway Facility Calibration
(Last updated: 12/11/2019)
Appendix 11C - Oregon Default Values
(Last updated: 08/23/2023)
Appendix 11D - Passenger Car Equivalents on Specific Grade
(Last updated: 10/23/2018)
Appendix 11E - Software Guidance for Oregon Specific Default Values
(Last updated: 08/23/2023)
Appendix 11F - Reliability Data Guidance
(Last updated: 12/11/2019)

Chapter 12 - Unsignalized Intersection Analysis
(Last updated: 08/23/202)

Appendix 12A/13A - Software and Settings for Intersection Analysis (Last updated: 11/22/2023)

Chapter 13 - Signalized Intersection Analysis
(Last updated: 08/21/2024)

Appendix 12A/13A - Software and Settings for Intersection Analysis (Last updated: 11/22/2023)

Chapter 14 - Multimodal Analysis (Last updated: 02/19/2025)

Chapter 15 - Traffic Simulation Models - Update in progress
(Last updated: 08/23/2023)

Addendum 15A - Protocol for Vissim Simulation
(Last updated: 01/23/2020)

Chapter 16 - Environmental Traffic Data - Not yet complete
(Last updated: 09/30/2024)

Appendix 16A - Example Noise Traffic Data Request Form (Last updated: 01/24/2024)
Appendix 16B - Example Air Quality Traffic Data Request Form (Last updated: 01/24/2024)

Chapter 17 - Travel Demand Modeling (Last updated: 03/01/2024)

Appendix 17A - Network Count Attribution
(Last updated: 06/08/2022)

Chapter 18 - Operational Analysis (Last updated: 01/27/2020)

Appendix 18A - Summary of TSMO Strategies
(Last updated: 06/23/2017)

Chapter 19 - Traffic Analysis Documentation
(Last updated: 08/23/2023)

Appendix 19A - Sample Methodology Memorandum
(Last updated 05/17/2022)

Glossary (Last updated: 06/04/2024)

Abbreviations and Acronyms (Last updated: 06/04/2024)

The following reference papers and reports are provided for informational purposes only regarding how procedures were developed. Always use the latest version of the Analysis Procedure Manual, or APM, for current procedures.

Truck Access in Roundabouts Research Notes: This is a summary of a recent research project dealing with large trucks and roundabouts and summarizes recommendations for analyzing and simulating roundabout operations. This is planned to be incorporated into the upcoming Chapter 15 update.
CAV in HCM Final Report: This report details the findings for the CAV pooled-fund study to create capacity adjustment factors for the HCM.
Oregon Scenarios for Studying CAVs in Travel Demand Models: This memorandum contains discussion of factors and guidance for creating scenarios incorporating connected and autonomous vehicles (CAV).
Use of v/c Ratio vs. Delay for Planning and Design Decisions for Signalized Intersections: This paper presents a comparison of the use of volume/capacity (v/c) ratio versus delay for signalized intersections, and recommends a method that should be used for planning and design decisions.
Supplemental Materials: Most supplemental files have been combined into this single document. This document includes:

Alternative Traffic Assignment Methods Framework Report: This paper evaluates alternative traffic assignment methods that can be used for various applications in ODOT TPAU's transport models and those of its OMSC partner agencies. For more information refer to APM Chapter 17.
Re-validating and Improving Queue Length Models at Two-Way Stop Controlled Intersections: This paper presents a refined study of queue lengths estimation by lane group at two-way stop controlled intersection approaches.
Simulation Guidelines Project - Towards APM Chapter 8 Revision: This project set out to develop a set of rules and criteria for creating, calibrating, and analyzing the results from a microsimulation.
Development of Queue Length Models at Two-way STOP Controlled Intersection: A Surrogate Method: This paper presents a model to estimate queue lengths at two-way stop controlled intersections.
Queue Lengths at Single Lane Roundabouts in Oregon: This paper summarizes the results of a study of queue lengths at single-lane roundabouts in Oregon and recommends a method that should be used by the Department.
Use of Short-term Interval Counts to Determine K Factors: This paper clarifies the traffic count procedures that should be used to determine the K Factor. Data and calculations used in the study can be found in the K Factor Summary Table.
K Factor Summary Table
Modeling Follower Density on Two-Lane Rural Highways: This white paper updates a 2010 study and documents a 2013 study to develop an improved follower density-based performance measure and methodology for analysis of two-lane highways in Oregon.
Modeling Performance Indicators on Two-Lane Rural Highways: The Oregon Experience: This paper presents a model for estimating follower density on two-lane highways which was found to be superior to current performance measures.
Network Capacity Calculation for Area Type
- Report
- Field Data and Summary Sheets
- Maps: TAZ Density and Average Density Calculations
- HCM Capacity Calculations

2025 Change Sheets (updated 02/19/2025)
2024 Change Sheets
2023 Change Sheets

The Analysis Procedures Manual User Group, or APMUG, is open to all interested parties either internal or external to ODOT. For information on APMUG, see the Analysis Procedures Manual User Group Guidelines. If you are interested in joining the group, contact Email APM.

APMUG meetings are generally held quarterly, on the second Wednesday of January, April, July and October.

The Future Volume, ATR Characteristic and Seasonal Trend Tables contain traffic volume related data which is updated annually. This data is intended for use in developing existing and future volumes and described in the APM version 2, Chapters 5 and 6.

The Future Highway Volume Table is created using data from the Transportation Volume Tables, or TVT, which are maintained by the Transportation Systems Monitoring Unit's Traffic Counting Program. For information on how to use this table, see Section 6.5 of the Analysis Procedures Manual.

Note: The future volumes are estimates only and local growth patterns and comprehensive plans may affect the actual outcome. Any growth rates calculated from the Future Volumes Table are only a beginning point of estimating future volumes. Engineering judgment needs to be applied to the numbers.

RSQ values labeled with "MODEL" show future volumes calculated using the current transportation demand model for that urban area. RSQ values labeled with "SWIM" show future volumes calculated using the current Statewide Integrated Model (SWIM) where the Auto Operating Cost is constant in the future.

New for 2024 - Please understand that future volumes uploaded to Highway Inventory Reports (TTRAF) will no longer match 100% to what is located here in the Future Volume Tables. Future Volumes that are uploaded to the TTRAF files and then uploaded to the FHWA database are subject to a rule that states Future Volume AADT must be greater than Current AADT (no declining growth).

Future Highway Volume Table
Note: The highway number is the Department's Internal highway number, not the route (OR/US/I) number.
Traffic Counting Program
Analysis Procedures Manual Chapter 6

The Automatic Traffic Recorder, or ATR, Characteristic Table can be used to estimate seasonal traffic count adjustments. For information on how to use this table, see Section 5.4.2 of the Analysis Procedures Manual.

The ATR Characteristic Map is web based mapping tool that displays ATR’s based on their characteristic trend. Detailed information can be displayed on the map by clicking on ATR symbols. The ATR Characteristic Table and map are updated on a yearly basis, typically in September.

The Seasonal Trend Table can also be used to estimate seasonal traffic count adjustments. The Seasonal Factor Table is updated on a yearly basis, typically in September. Season Trend Table factors are calculated using the previous full year of ATR data. For information on how to use this table, see Section 5.5.4 of the Analysis Procedures Manual.

Contact

Email APM
Telephone 503-991-9598

Announcements

The results of a recent ODOT research study will change how VISSIM is used to simulate roundabouts. See the Supplemental Material section.

Connected & Automated Vehicles: Guidance for accounting for capacity effects of CAV’s for future year analyses is available in APM Appendix 6B.

The APM has been updated as of February 2025. Please see the 2025 change sheets for details.

Next APM User Group Meeting

Date: TBA
Location: Microsoft Teams Meeting
Start time: 9:00 am
End time: 11:30 am

Please submit any suggestions for agenda topics or presenters to

Email APM.

Analysis Procedures Manual

APM Version 2

Individual Chapters

Supplemental Materials

Change Sheets

APM User Group

Related Technical Data

Future Highway Volume Table

Automatic Traffic Recorder Characteristic Table and Map

Seasonal Trend Table

Contact

Announcements