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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: 06/04/2024)

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: 06/04/2024)

Acknowledgements​ (Last updated: 11/22/2023)

Preface​ (Last updated: 04/06/2023​)

Chapter 1 (Last updated: 07/19/2018)
Chapter 2 - Scoping Projects (Last updated: 05/17/2022)​​ Chapter 3 - Transportation System Inventory 
(Last updated: 03/01/2024) Chapter 4 - Safety (Last updated: 9/22/2019)

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

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

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

Chapter 8 - Mesoscopic Analysis (Last updated: 07/19/2018) Chapter 9 - Transportation Analysis Performance Measures
(Last updated: 03/16/2020)
Chapter 10 - Analyzing Alternatives (Last updated: 06/08/2022) ​ ​ Chapter 11 - Segment and Facility Analysis
(Last updated: 08/23/2023)​​
Chapter 12 - Unsignalized Intersection Analysis​
(Last updated: 08/23/202​)​​
Chapter 13 - Signalized Intersection Analysis​
(Last updated: 08/23/2023​)​​​

Chapter 14 - Multimodal Analysis (Last updated: 10/22/2020)

Chapter 15 - Traffic Simulation Models - Update in progress
(Last updated: 08/23/2023​)​​​
Chapter 16 - Environmental Traffic Data - Not yet complete ​
(Last updated: 03/01/2024​)
Chapter 17 - Travel Demand Modeling (Last updated: 03/01/2024​)​​​ Chapter 18 - Operational Analysis (Last updated: 01/27/2020​)​​​​ Chapter 19 - Traffic Analysis Documentation
(Last updated: 08/23/2023)​​​​

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 Rearch 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

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  APM.

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

Related Technical Data

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. The 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.

​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.


Email APM
Telephone 503-991-9598


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 June 2024. Please see the 2024 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.