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 Some of the information contained in these papers may be outdated.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 Analysis Procedure Manual (APM)
for current procedures.
- Re-validating and Improving Queue Length Models at Two-Way Stop Controlled Intersections
The Re-validating and Improving Queue Length Models at Two-Way Stop Controlled Intersections (PDF) paper presents a refined study of queue lengths estimation by lane group at two-way stop controlled intersection approaches. New models for minor left and minor right turn lane groups are added. The study also checked the relative performance of developed models with the two-minute rule, HCM 2010 method, and John T. Gard’s queue length models. Model validation shows that the developed models are predicting queue lengths better than other methods.
- Simulation Guidelines Project - Towards APM Chapter 8 Revision
The Simulation Guidelines Project - Towards APM Chapter 8 Revision (PDF) 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
The Traffic Count Guidelines (PDF) offer 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
The Clarification of v/c Ratio Calculation (PDF) 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
The Use of v/c Ratio vs. Delay for Planning and Design Decisions for Signalized Intersections (PDF) 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
The Updated Roundabout Analysis Methodology (PDF) presents a comparison of several different roundabout analysis methodologies and recommends a method that should be used by the Department.
- Development of Queue Length Models at Two-way STOP Controlled Intersection: A Surrogate Method
This Development of Queue Length Models at Two-way STOP Controlled Intersection: A Surrogate Method (PDF) paper presents a model to estimate queue lengths at two-way stop controlled intersections. The model was developed using data collected at 40 unsignalized intersections. The new model was found to out-perform existing methods in predicting observed queue lengths. Additional data collection is planned to make further refinements to the model over time.
- Storage Estimates for Unsignalized Intersections
This Storage Estimates for Unsignalized Intersections (PDF) 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 Use of Short-term Interval Counts to Determine K Factors (PDF) 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 (PDF).
- Modeling Performance Indicators on Two-Lane Rural Highways: The Oregon Experience
This Modeling Performance Indicators on Two-Lane Rural Highways: The Oregon Experience (PDF) 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