 The cell transmission model with free-flow speeds varying over time or spaceMalachy Carey Transportation Research Part B: Methodological, 2021, vol. 147, issue C, 245-257 Abstract: In the cell transmission model (CTM), time is discretised into time-steps and links discretised into cells. In the original CTM, and usually thereafter, the cell lengths are chosen so that, at free-flow speeds (ffs), traffic travels exactly one cell per time-step (1 cpts), so that the ffs, denoted α, is exactly α = 1 cpts and, to avoid computational complications, the length of each cell is normally held constant over time. But the actual observed ffs's in a cell will often differ by time of day or traffic type or traffic lane, or due to speed limits that vary over time or space, or due to stochastic effects. By construction, the maximum ffs in each cell is 1 cpts (α = 1), hence when the ffs is varying within a cell, it will often be less than 1 (α < 1). Keywords: Cell transmission model; Free flow; Free flow speed less than 1; Uncongested traffic; Approximation error; Corrected outflows; Corrected travel times (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:transb:v:147:y:2021:i:c:p:245-257 Ordering information: This journal article can be ordered from DOI: 10.1016/j.trb.2020.05.012 Access Statistics for this article Transportation Research Part B: Methodological is currently edited by Fred Mannering More articles in Transportation Research Part B: Methodological from Elsevier |
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