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MultiTypeSensors.md

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  • The overarching rationale of transportation system intelligence is that developments in sensing, cyber-physical infrastructures, and crowdsouring big data technologies can be integrated to effecitive use for improving the performance of transportation systems.

  • This paper first proposes a multi-layered Hierarchical Flow Network (HFN) to structurally model different levels of travel demand variables using multiple data sourses.

Multiple data sources:

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Household travel surveys can provide trip production and abstraction from zones and sometimes OD trip tables between the zones.

A number of studies are devoted to finding how to incorporate Mobile phone sample data into activity-based models to estimate trip chain behavior.

GPS/Floating car Data can be used to estimate the observed travel time of links and establish urban traffic indexes.

Large volumes of observed link counts can be collected from sensors including inductive loops,radars,cameras,etc.

The four-layered HFN representation:

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Wei Ma PolyU image image image


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