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Suggested Citation:"Table of Contents." National Academies of Sciences, Engineering, and Medicine. 2020. Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets. Washington, DC: The National Academies Press. doi: 10.17226/25963.
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Suggested Citation:"Table of Contents." National Academies of Sciences, Engineering, and Medicine. 2020. Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets. Washington, DC: The National Academies Press. doi: 10.17226/25963.
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Page 5
Page 6
Suggested Citation:"Table of Contents." National Academies of Sciences, Engineering, and Medicine. 2020. Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets. Washington, DC: The National Academies Press. doi: 10.17226/25963.
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- iv - TABLE OF CONTENTS SUMMARY ............................................................................................................................................... 1 1. INTRODUCTION ............................................................................................................................. 3 2. LITERATURE REVIEW ................................................................................................................ 4 3. CRITICAL REVIEW OF THE HCM .......................................................................................... 8 4. PERFORMANCE MEASURES .................................................................................................. 12 5. QUEUE SPILLBACK INTO FREEWAYS .............................................................................. 14 6. QUEUE SPILLBACK INTO URBAN STREETS ................................................................... 27 7. LANE-BY-LANE SPEED AND FLOW ESTIMATION METHODS FOR FREEWAYS .................................................................................................... 35 8. SYSTEM ANALYSIS ..................................................................................................................... 41 9. SOFTWARE IMPLEMENTATION .......................................................................................... 43 10. CONCLUSIONS AND RECOMMENDATIONS .................................................................... 43 REFERENCES ....................................................................................................................................... 45 APPENDIX A. CHAPTER 38: SYSTEM ANALYSES .......................................................... 47 APPENDIX B. OFF-RAMP QUEUE SPILLBACK.............................................................. 232 APPENDIX C. FREEWAY OFF-RAMP – QUEUE SPILLBACK ANALYSIS ................ 245 APPENDIX D. ON-RAMP QUEUE SPILLBACK CHECK ................................................ 293 APPENDIX E. ON-RAMP QUEUE SPILLBACK ANALYSIS .......................................... 304 APPENDIX F. FREEWAY FACILITIES LANE-BY-LANE ANALYSIS ......................... 351 APPENDIX G. GLOSSARY .................................................................................................... 378

- v - LIST OF FIGURES Figure 1 – HCM service measures by system element and mode .................................................. 8 Figure 2 – Schematic of a diverge influence area (HCM) .............................................................. 9 Figure 3 – Recommended performance measure framework for different evaluation purposes ..................................................................................................... 13 Figure 4 – Data collection framework for queue spillback into freeway facilities ....................... 15 Figure 5 – Survey for off-ramp queue spillback study sites – outcome by state .......................... 16 Figure 6 – Miami, FL – I-95 SB to SW 25th Rd. .......................................................................... 17 Figure 7 – Tampa, FL – I-275 NB to SR-60 ................................................................................. 17 Figure 8 – Norfolk, VA – I-64 WB to Northampton Blvd ........................................................... 18 Figure 9 – Centreville, VA – I-66 WB to SR-28 (Sully Rd) ........................................................ 18 Figure 10 – Centreville, VA – I-66 EB to SR-28 (Sully Rd) ........................................................ 18 Figure 11 – Minneapolis, MN – I-35W SB to 35th St. ................................................................. 18 Figure 12 – Atlanta, GA – I-285 NB to I-20................................................................................. 19 Figure 13 – Miami, FL – I-75 SB to SR 826 ................................................................................ 19 Figure 14 – Atlanta, GA – I-285 NB to GA-141 .......................................................................... 19 Figure 15 – Sacramento, CA – SR-99 NB to SR-50..................................................................... 19 Figure 16 – Back-of-queue length measurement – off-ramp queue spillback .............................. 20 Figure 17 – Sample of data illustrating queue spillback: (a) queue length and (b) speeds by lane ..................................................................................... 21 Figure 18 – Unbalanced lane usage at the off-ramp: (a) right lane and (b) left lane .................... 22 Figure 19 – Effects of queue spillback across freeway lanes at three locations upstream of the exit experiencing spillback (I-275 EB – Tampa, FL) ...................................... 22 Figure 20 – Blockage of one (a) or two (b) mainline lanes due to off-ramp queue spillback ...... 23 Figure 21 – Example of a forced merging maneuver for a vehicle attempting to join the off-ramp queue .............................................................................................................. 24 Figure 22 – Micro-simulated off-ramp queue spillback (I-105@Bellflower Interchange – Los Angeles, CA) ................................................................................................ 24 Figure 23 – Procedure for identifying spillback occurrence at an off-ramp/weaving segment .... 25 Figure 24 – Expanded link-node structure to evaluate the off-ramp segment .............................. 26 Figure 25 – Data collection framework for queue spillback into urban streets (signalized intersection) ............................................................................................................. 27 Figure 26 – I-285 NB @ South Cobb Dr. and affected movements by on-ramp queue spillback: (a) NB-Th/R and (b) SB-L ......................................................................................................... 30 Figure 27 – I-285W SB @ Cobb Pwky Dr. and affected movements by on-ramp queue spillback: (a) NB-L and (b) SB-Th/R .............................................................................. 31 Figure 28 – I-285W NB @Cobb Pkwy Dr. with NB-R movement affected by on-ramp queue spillback ............................................................................................................ 31 Figure 29 – Friars Rd. @ I-15 NB with WB-R movement affected by on-ramp queue spillback........................................................................................................................... 32 Figure 30 – Partial blockage of northbound through movement by vehicles trapped inside the intersection box ............................................................................................ 33 Figure 31 – Procedure for identifying spillback occurrence at an on-ramp ................................. 35

- vi - Figure 32 – Comparison of lane flow distribution on two different 2-lane segments: (a) Minneapolis, MN and (b) Salt Lake City, UT ...................................................................... 37 Figure 33 – Comparison of lane flow distribution on two different 3-lane segments: (a) Tampa, FL and (b) St. Paul, MN ......................................................................... 38 Figure 34 – Comparison of lane flow distribution on two different 4-lane segments: (a) Salt Lake City, UT and (b) Tampa, FL ............................................................... 39 Figure 35 – Field data and predicted speed-flow curve for (a) lane 1 and (b) lane 2 (CA-1 NB – Santa Cruz, CA) .................................................................................... 41 Figure 36 – Origins and destinations for a sample network (Gainesville, FL) ............................. 42

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Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets Get This Book
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The procedures detailed in the 6th Edition of the Highway Capacity Manual (HCM) estimate capacity and several operational measures, including those determining Level of Service, for freeway facilities as well as surface streets.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 290: Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets introduces materials to help modify the freeway analysis methods and the urban street methods so that the effects of operations from one facility to the other can be evaluated.

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