A hybrid gravity and route choice model to assess vector traffic in large-scale road networks

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dc.contributor.authorFischer, Samuel M.
dc.contributor.authorBeck, Martina
dc.contributor.authorHerborg, Leif-Matthias
dc.contributor.authorLewis, Mark A.
dc.date.accessioned2025-04-15T19:22:07Z
dc.date.available2025-04-15T19:22:07Z
dc.date.issued2020
dc.description.abstractHuman traffic along roads can be a major vector for infectious diseases and invasive species. Though most road traffic is local, a small number of long-distance trips can suffice to move an invasion or disease front forward. Therefore, understanding how many agents travel over long distances and which routes they choose is key to successful management of diseases and invasions. Stochastic gravity models have been used to estimate the distribution of trips between origins and destinations of agents. However, in large-scale systems, it is hard to collect the data required to fit these models, as the number of long-distance travellers is small, and origins and destinations can have multiple access points. Therefore, gravity models often provide only relative measures of the agent flow. Furthermore, gravity models yield no insights into which roads agents use. We resolve these issues by combining a stochastic gravity model with a stochastic route choice model. Our hybrid model can be fitted to survey data collected at roads that are used by many long-distance travellers. This decreases the sampling effort, allows us to obtain absolute predictions of both vector pressure and pathways, and permits rigorous model validation. After introducing our approach in general terms, we demonstrate its benefits by applying it to the potential invasion of zebra and quagga mussels (Dreissena spp.) to the Canadian province British Columbia. The model yields an R2-value of 0.73 for variance-corrected agent counts at survey locations.
dc.description.reviewstatusReviewed
dc.description.scholarlevelFaculty
dc.description.sponsorshipS.M.F. is thankful for the funding received from the Canadian Aquatic Invasive Species Network; M.A.L. gratefully acknowledges an NSERC Discovery Grant and Canada Research Chair.
dc.identifier.citationFischer, S. M., Beck, M., Herborg, L., & Lewis, M. A. (2020). A hybrid gravity and route choice model to assess vector traffic in large-scale road networks. Royal Society Open Science, 7(5), 191858. https://doi.org/10.1098/rsos.191858
dc.identifier.urihttps://doi.org/10.1098/rsos.191858
dc.identifier.urihttps://hdl.handle.net/1828/21933
dc.language.isoen
dc.publisherRoyal Society Open Science
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectgravity model
dc.subjecthierarchical model
dc.subjectinfectious disease
dc.subjectinvasive species
dc.subjectpropagule pressure
dc.subjectzebra mussel
dc.titleA hybrid gravity and route choice model to assess vector traffic in large-scale road networks
dc.typeArticle

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