Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets (2020) / Chapter Skim
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Pages 41-46
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From page 41... ...
- 35 - Figure 31 – Procedure for identifying spillback occurrence at an on-ramp If spillback is detected, the queue length along the on-ramp is estimated and compared to the available storage. If the queue length is greater than the available storage length, then spillback is expected to occur.
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From page 42... ...
- 36 - This section summarizes the framework developed for lane-by-lane analysis of freeway facilities. The full methodology for evaluation of lane-by-lane performance measures in freeway facilities is described in detail in Appendix F: Freeway Facilities – Lane-by-Lane Analysis.
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From page 43... ...
- 37 - Figure 32 – Comparison of lane flow distribution on two different 2-lane segments: (a) Minneapolis, MN and (b)
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- 38 - Figure 33 – Comparison of lane flow distribution on two different 3-lane segments: (a) Tampa, FL and (b)
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- 39 - Figure 34 – Comparison of lane flow distribution on two different 4-lane segments: (a)
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From page 46... ...
- 40 - The adjustment factors fa and fc are calculated as a function of a series of parameters, as follows: 𝑎 = 𝑎 + 𝐺 × 𝑎 + 𝑡 × 𝑎 + 𝑛 × 𝑎 (Equation 3) 𝑏 = 𝑏 + 𝐺 × 𝑏 + 𝑡 × 𝑏 + 𝑛 × 𝑏 (Equation 4)
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