Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets (2020)

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- 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