Capacity Analysis of Traffic-Actuated Intersections Final Report (1996) / Chapter Skim
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APPENDIX D
APPENDIX D
Pages 111-122
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through D-9 is presented in Table D-~. The derivations are presented in a format similar to the format used in the supplemental worksheet now contained in HCM Chapter 9 for uniform delay computations with compound left turn protection.
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Points in the cycle at which the queue size is important to the computations are also identified as fol lows: Qr indicates the queue size at the end of the elective red Qq indicates the queue size at the end of the interval gq Qp indicates the queue size at the end of the permitted green period Q'p indicates the queue size at the end of the perrnined Been period, adjusted for sneakers Qg,, indicates the queue size at the beginning ofthe protected green (green arrow) period Qf indicates the queue size at the end of the interval gf The flow rates that determine the slopes ofthe various sections of the QAPs are indicated es follows: qa indicates the arrival flow rate' which is assumed constant over the cycle s indicates the saturation flow rate for protected movements sp indicates the saturation flow rate for permitted movements.
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Table D-~. Summary of phasing alternatives for the computation of uniform delay Figure l Description of Phasing Alternative 1 D-1 | Single protected base l D-2 | Permitted left fur s from an exclusive lane.
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phases 2 & 6 only Figure D-1. Uniform delay computation for a single protected phase Appendix D: Page 4
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Uniform delay computation for permitted left turns from an exclusive lane Appendix D: Page 5
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Uniform delay computation for permitted left turns from a shared lane (gq ' gr) Appendix D: Page 6
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Uniform delay computation for permitted left turns from a shared lane (gq < gf3 Appendix D: Page 7
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Uniform delay computation for compound left turn protection (Case 1) Appendix D: Page 8
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] qa C Condition 2 QST ~ gu QP = Qq gu (sp qa)
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Uniform delay computation for compounc! left turn protection (Case 3)
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Uniform delay computation for compound left turn protection (Case 4) Appendix D: Page 11
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Uniform delay computation for compound left turn protection (Case 5) Appendix D: Page 12
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