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CONTENTS Acknowledgments Summary ........ Chapter One. In~oduchon and Overview Chanter Two Available Methodolome.~ Critical Gap and Follow-up Time Capacity Models ... Delay Models ............................................................................ Sununary ................................................................................ · ······~ Chapter Three. Candidate Models ................................................................... 10 19 27 29 29 31 32 Model Evaluation and Selection 33 Critical Gap Estimation Procedures C anacitY Models .......................................................................... ---r-~ At Delay Models ............................................................................ Data Requirements for Recommended Models Rambling Plan Chapter Four. Field Data Collection 35 .................................................. 35 35 38 42 Critical Gap and Follow-up Tune Estimation 44 Field Capacity Estimation ................................................................... Field Delay Estimation ..................................................................... bate t;haractenstlcs ........................................................................ Data Reduction Process .................................................................... Chapter Five. Critical Gap and Follow-up Tune 55 Analysis of Factors Affecting Critical Gap and Follow-up Tune 55 A Relationship Between Critical Gap and Follow-up Tune 61 62 50 53 Recon~nended Values ...................................................................... Chapter Six. Capacity ............. Basic Capacity Model Testing Weights of Onnn.~in~ Flow. Impedance Effects ......... Validation Testing ............. Summary Results and Conclusions Chapter Seven. Delay .................................. 65 65 66 69 71 71 75 Basic Delay Model Testing 75 Assessment of Simulation Models 79 Sunny and Conclusions 81 i
Chapter Eight . Special Capacity and Delay Issues Two-Stage Gap Acceptance Flared Minor Street Approach ......... Effect of Upstream Signals ................ The Effect of Pedestrians on Capacity and Delay Delay to Major Sheet Through Vehicles Conclusions ............................ Chapter Nine. Control Type, Queuing, and LOS Issues MUTCD Signal Warrants ......................... ~l`~-T~n~h ~ Want 83 83 91 94 104 108 109 `,~v~v ~ ~e,~,~w ~ ,, ..... .............................. Implications of Using Average Delay as the Only Cntena for Level of Service Chapter Ten. Recommended Computational Procedures References ...................... NCHRP 3-46 Working Papers 111 111 118 119 123 135 138
ACKNOWLEDGMENTS This report documents the work performed by the University of Idaho, Kittelson and Associates, Ruhr University, and Queensland University of Technology under NCHRP 3-46. Dr. Michael Kyte was the Principal Investigator for the research and the primary author of Volume 2 of the final report. Mr. Wayne Kittelson was the Principal Researcher for Kittelson and Associates. Dr. Werner Briton was He Principal Researcher for Ruhr University. Dr. Rod Troutbeck was He Principal Researcher for Queensland University of Technology. Mr. Bruce Robinson of Kittelson and Associates and Mr. Zongthong Tian of the University of Idaho were the primary authors of Volume ~ of the final report. Other staff members who made major contributions to the project and to the final report included Zakir Mir and Zia Hameedmansoor of He Un~versi~ of Idaho, Mark Vandehey and Marc Butorac of Kittelson and Associates, and Lothar Bon~zio and Ning Wu of Ruhr University. The successful completion of this project could not have been possible without the cooperation and hard work of all of the Research Team members mentioned above. The Research Team received substantial assistance from a number of traffic engineering departments from around the United States in identifying sites for field data collection. The NCHRP 3-46 panel contributed a significant amount of guidance and technical assistance during all aspects of this project.
