| Background Papers and Reports |
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 The following papers and reports are provided for informational purposes only, as a reference regarding how certain procedures were developed. Some of the information contained in these papers may be outdated. Always use the latest version of the APM for current procedures.
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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. Although this study was not totally conclusive, it was used to refine previous simulation practices conducted by ODOT and produced a wide array of useful findings and relationships which will be incorporated into the APM and used as the jumping off point for future work.
Traffic Count Guidelines
This paper offers guidance to planning and other staff who are obtaining traffic counts for plans and projects. The 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.
Updated Roundabout Analysis Methodology
This methodology paper presents a comparison of several different roundabout analysis methodologies and recommends a method that should be used by the Department.
Storage Estimates for Unsignalized Intersections
This paper presents a comparison of different methods to estimate queue lengths at unsignalized intersections, 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 table KFactorSummary.pdf.
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| Network Capacity Calculation for Area Type |
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This 1997 report attempts to make correlations between the travel demand modeling area type parameter and saturation flow. This is also the background report behind the decision to use 1800 pcphgpl as the ideal saturation flow rate.
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