Dynamic, Integrated Model System: Sacramento-Area Application, Volume 2: Network Report (2014) / Chapter Skim
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Pages 17-23
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17 C h a p t e r 4 For modeling the transit component, FAST-TrIPs is divided into two main submodules: transit assignment and simulation. Above all, the transit assignment submodule plays the role of passenger assignment for given OD pairs.
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18 and simulation in DynusT. This is indicated on the right side of Figure 1.1, DynusT–FAST-TrIPs integration framework.
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19 vehicles at stops, including the following: a vehicle pulls out of the traffic stream at bus pullouts but remains in the traffic stream for curbside stops; dwell times allow for passengers to alight and to board, depending on passenger type (pedestrian, bicycle, wheelchair) ; a bus may bypass a stop if no passengers want to board or alight (so-called hail stop operation)
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20 processing a subset of stops and finds the shortest path in a shorter amount of time compared to traditional shortest path algorithms. The general form of the algorithm is shown in Figure 4.2; the form can be either label-setting or labelcorrecting, but the label-correcting form is used for the application in this project.
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21 The result of the TBSP is a shortest path tree from the origin to all destinations. So the path to a specific destination will be found by tracking the predecessors from the destination stop to the origin stop.
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22 In FAST-TrIPs, these data are used in a simulation of transit passenger travel. This simulation likewise follows a high temporal resolution, using a 1-second interval.
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23 In the transit assignment, intermodal passenger trips are modeled similarly to other passenger trips with the difference that either the origin or the destination is a park-andride location. The assignment model generates the path for passengers, and the passengers are simulated at the same time with other passengers.
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