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 - 29MB

Individual Chapters

Appendix 1A - ODOT Traffic Engineering Authority

Chapter 2 - Scoping Projects

Chapter 3 - Transportation System Inventory

Chapter 4 - Safety

Appendix 4A - Crash Attribution and Automation

Chapter 5 - Developing Existing Year Volumes

Chapter 6 - Future Year Forecasting

Appendix 6A - Sample Application of Enhanced Zonal Cumulative Analysis

Chapter 7 - System Planning Analysis

Chapter 8 - Mesoscopic Analysis

Chapter 9 - Transportation Analysis Performance Measures

Chapter 10 - Analyzing Alternatives

Chapter 11 - Segment and Facility Analysis

Chapter 12 - Unsignalized Intersection Analysis

Appendix 12A/13A - Software and Settings for Intersection Analysis

Chapter 13 - Signalized Intersection Analysis

Appendix 12A/13A - Software and Settings for Intersection Analysis

Chapter 14 - Multimodal Analysis

Chapter 15 - Traffic Simulation Models - Update in progress

Addendum 15A - Protocol for Vissim Simulation

Chapter 16 - Environmental Traffic Data - Not yet complete

Appendix 16A - Example Air and Noise Traffic Data Request Forms

Chapter 17 - Travel Demand Modeling

Chapter 18 - Operational Analysis

Appendix 18A - Summary of TSMO Strategies

Chapter 19 - Traffic Analysis Documentation - Not yet complete

Glossary

Abbreviations and Acronyms

Supplemental Materials

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.

Alternative Traffic Assignment Methods Framework Report: This paper evlauates 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.
Traffic Count Guidelines: These guidelines cover the different count types and data available, when to obtain counts, where to place counts and how to write count requests.
Clarification of v/c Ratio Calculation: This paper clarifies methodology and parameters used to calculate volume to capacity (v/c) ratios to compare to the Oregon Highway Plan (OHP) and Highway Design Manual (HDM) mobility standards.
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.
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.
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

Change Sheets

2020 Change Sheets
2019 Change Sheets
2018 Change Sheets
2017 Change Sheets
2016 Change Sheets

APM User Group

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.

Future Highway Volume Table

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 5.5 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.

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

Automatic Traffic Recorder Characteristic Table and Map

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.

Year 2017 ATR data from approximately mid-August through mid-September should be used with caution. Traffic patterns in many areas of the state were disrupted in this period due to the 2017 solar eclipse, followed by major fires in the Columbia River Gorge. The 2017 TVT ATR section identifies affected ATRs.

Seasonal Trend Table

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

APM
503-986-4111

Announcements

The APM has been updated as of March 2020. Please see the 2020 change sheet for what has changed.

Next APM User Group Meeting

Date: Wednesday, April 8, 2020
Location: Online Webinar
Start time: 9:00 a.m.
End time: 11:30 a.m. (approximate)

Please submit any suggestions for agenda topics or presenters to APM.