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CONTENTS Acknowledgments Summary Chapter One. Introduction and Overview Chapter Two. Previous Work Hebert and the 1985 HCM Richardson Model ..... TRC 373 and He 1994 HCM . . . Recent Work ....... Chapter Three. Theory and Models .............. Concepts of Capacity and Delay ........... Description of Intersection Operations ....... Candidate Capacity Models Candidate Delay Models .. 13 13 Model Evaluation and Selection 14 Description of Recommended Capacity Model . Description of Recommended Delay Model . . . Chapter Four. Field Data Collection Sampling Plan ......... Geometric Configurations . . Geometry Groups ....... Data Reduction ......... Traffic Character~shcs ..... Chapter Five. Saturation Headways ..... Importance of Saturation Headways Research Hypotheses: Factors Affecting Saturation Headways Hypotheses Tests-Group 1 Sites ....... Hypotheses Tests-Groups 2, 3 and 4 Sites . . . Hypotheses Tests-Groups 5 and 6 Sites .... Regression Analysis-Groups 1 - Sites ..... Regression Analysis-Groups 5 and 6 Sites . Findings and Recommended Values ..... . . . 24 25 · · · · · · - Tic , . . JO I . . ^1 ~7 . . 41 28 29 .. .31 . . 31 . . .31 . . 32 41 . . 44 . . . 45 . . . 47 48
Chapter Sm. Service Time . Field Measurements Theoretical Mode} Testing . . Mode} Testing ~ Field Data Validation . 51 . . 52 Findings and Recommendations Chapter Seven. Delay Models . . . FiP,lt1 M~r~,mP,nt.~ 57 Model Testing ................... Validation .................... Level of Service Forecasts Findings and Recommendations Chapter Eight. Recommended Computational Procedure Initial Conditions and Adjusunents Headway and Service Time ~n~.itv 58 59 60 63 63 64 65 65 66 Delay and Level of service Sample Calculation References NCHRP 346 Working Papers 69 69
ACKNOWLEDGMENTS This report documents the work performed by Be Un~versitr of Idaho, Kittelson and Associates, Ruhr University, and Queensland University of Technology under NCHRP 3-46. Dr. Michael Kyte was the Principal l~vestigator for the research and the primary author of Volume 2 of the final report Mr. Wayne Kittelson was Be Principal Researcher for Kittelson and Associates. Dr. Werner Briton was the Pnncipal Researcher for Ruhr University. Dr. Rod Troutbeck was tibe Pnucipal Researcher for Queensland University of Technology. Mr. Bruce Robinson of Kittelson and Associates and Mr. Zongthong Tian of Be University of Idaho were the primary authors of Volume 1 of Be final report. Other staff members who made major contributions to the project and to the final report included Zalcir Mir and Zia Hameedmansoor of the University of Idaho, Mark Vandehey and Marc Butorac of Kittelson and Associates, and Molar Bondzio and Ding Wu of Ruhr University. The successful completion of this project could not have been possible without the cooperation and hard work of all of He Research Team members mentioned above. The Research Team received substantial assistance from a number of Chic engineering departments from around He United States In identifying sites for field data collection. The NCHRP 3-46 pane! contributed a significant amount of guidance and technical assistance during all aspects of this project.
