The freeway reliability analysis relies on the freeway facilities core methodology presented in Chapter 10 of the HCM 7th Edition, which is described in

Chapter 9

of this manual. A base dataset is used to develop a base scenario, which is then adjusted to create a variety of different scenarios that represent the range of actual freeway capacity and facility demand as conditions on the facility change. The travel time distribution produced from the results of each scenario’s travel time calculations may be used to determine reliability performance measures of the analyzed freeway segment. Adjustments associated with TSMO and ATDM projects can then be applied to appropriate scenarios to assess the impacts of the projects.

Figure 15-1

shows the freeway reliability analysis methodology framework as shown in the HCM.