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How to Model the Effect of Gradient on Bicycle Traffic in Microscopic Traffic Simulation
Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics. Linköping University, Sweden.ORCID iD: 0000-0001-8488-0540
Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.ORCID iD: 0000-0002-1948-1858
Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics. The Swedish National Road and Transport Research Institute (VTI), Linköping, Sweden;Division for Communication and Transport Systems, Linköping University, Norrköping, Sweden.ORCID iD: 0000-0002-0336-6943
2022 (English)In: Transportation Research Record, ISSN 0361-1981, E-ISSN 2169-4052, Vol. 2676, p. 609-620Article in journal (Refereed) Published
Abstract [en]

Microscopic traffic simulation is a useful tool for the planning of motorized traffic, yet bicycle traffic still lacks this type of modeling support. Nonetheless, certain microscopic traffic simulators, such as Vissim, model bicycle traffic by applying models originally designed for car traffic. The gradient of a bicycle path has a significant impact on the speed of cyclists; therefore, this impact should be captured in microscopic traffic simulation. We investigate two calibration approaches to reproduce the effect of gradient on the speed of cyclists using the default driver behavioral model in Vissim. The first approach is to modify the simulated gradient to represent different values of the gradient-acceleration parameter: a fixed value that represents a decrease in the maximum acceleration that cyclists can apply on an uphill. The second approach is to adjust the maximum-acceleration function. We evaluate both approaches by applying a Vissim model of a bidirectional bicycle path with a 3% gradient in Stockholm. The results show that the current default implementation in the Vissim model underestimates the effect of gradient on speed. Moreover, the gradient-acceleration parameter does not directly reduce the maximum acceleration of all cyclists, but only of those cyclists riding above a certain speed. We conclude that by using a higher gradient-acceleration value than the default, we accurately estimate the observed mean speed on the uphill. However, neither of the investigated calibration approaches provides accurate estimates of the speed distributions. We emphasize the need for developing more accurate behavioral models designed for cyclists.

Place, publisher, year, edition, pages
Sage Publications, 2022. Vol. 2676, p. 609-620
National Category
Transport Systems and Logistics
Identifiers
URN: urn:nbn:se:vti:diva-19013DOI: 10.1177/03611981221094300ISI: 000810319600001Scopus ID: 2-s2.0-85141781490OAI: oai:DiVA.org:vti-19013DiVA, id: diva2:1698817
Available from: 2022-09-26 Created: 2022-09-26 Last updated: 2023-08-15Bibliographically approved
In thesis
1. Towards microscopic models for bicycle traffic simulation
Open this publication in new window or tab >>Towards microscopic models for bicycle traffic simulation
2023 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

As bicycling becomes an integral part of sustainable mobility, it becomes essential to enhance planning strategies that ensure bicycling as an efficient mode of transport. While traffic simulation has been extensively utilized for traffic planning of various modes of transport, this type of modeling support is largely lacking in the planning of bicycle traffic.

Given the high heterogeneity in the characteristics of bicyclists, the use of microscopic traffic simulation, which incorporates the explicit inclusion of individual properties and preferences, becomes particularly useful for evaluating bicycle traffic performance.

By examining real-world traffic, the objective of this thesis is to investigate essential requirements for microscopic modeling and simulation of bicycle traffic on off-street bicycle path segments, and to further develop and evaluate modeling approaches suitable for bicycle traffic. Understanding the fundamentals of how bicyclists interact with the infrastructure and other bicyclists is a necessary step towards accurate simulation of bicycle traffic.

In this thesis, research gaps related to the evaluation of bicycle traffic performance and simulation are identified, and methods to validate bicycling data are proposed to determine its quality and suitability for traffic analysis. Furthermore, two distinct modeling approaches are investigated to simulate the impact of gradients in bicycle traffic. The first involves calibrating a car-based model using a widely-used microscopic traffic simulation software, and the second implements a power-based model rooted in the physical forces acting on a bicycle. Lastly, characteristics of bicycle traffic that are relevant for simulating bidirectional traffic are identified and described.

The work in this thesis offers a starting point towards enhanced microscopic bicycle traffic simulation that effectively assist the planning of efficient bicycle traffic.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2023. p. 69
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:vti:diva-19829 (URN)10.3384/9789180752497 (DOI)9789180752480 (ISBN)9789180752497 (ISBN)
Presentation
2023-08-24, K3, Kåkenhus, Campus Norrköping, 09:15 (English)
Opponent
Supervisors
Funder
Swedish Transport Administration, 2019/84465
Available from: 2023-08-15 Created: 2023-08-15 Last updated: 2023-08-15Bibliographically approved

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Pérez Castro, GuillermoJohansson, FredrikOlstam, Johan

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