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Suggested Citation:"8. System Analysis." 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 47
Page 48
Suggested Citation:"8. System Analysis." 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 48

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

- 41 - Figure 35 – Field data and predicted speed-flow curve for (a) lane 1 and (b) lane 2 (CA-1 NB – Santa Cruz, CA) 8. System Analysis This section describes briefly the methodology developed for estimating travel time performance measures for specific O-D trips considering both urban streets and freeways. The details of the methodology are provided in Appendix A: Chapter 38 – Systems Analysis. The methodology provides the detailed steps to evaluate networks with freeway and urban street movements, as illustrated in the example of Figure 36.

- 42 - Figure 36 – Origins and destinations for a sample network (Gainesville, FL) The methodology in Chapter 38 generates the following performance measures: Freeway Facilities: • Flow, free-flow speed, operating speed, and capacity for individual lanes • Expected travel speed along each segment and each lane Urban Streets Facilities: • Travel time along each segment • Expected travel speed along each segment System Analysis: • Total and free-flow travel times • Travel Time Index • Average travel speed

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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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