Print Email Facebook Twitter Automatic fitting procedure for the fundamental diagram Title Automatic fitting procedure for the fundamental diagram Author Knoop, V.L. (TU Delft Transport and Planning) Daamen, W. (TU Delft Transport and Planning) Date 2016 Abstract The fundamental diagram of a road, including free-flow capacity and queue discharge rate, is very important for traffic engineering purposes. In the real word, most traffic measurements come from stationary loop detectors. This paper proposes a method to fit Wu's fundamental diagram to loop detector data. Wu's fundamental diagram is characterised by five parameters, being free-flow speed, wave speed, free-flow capacity, queue discharge rate and jam density. The proposed method entails fixing the wave speed and the free-flow speed. The method consists of two steps. We first use a triangular fundamental diagram to separate the congested branch from the free-flow branch. Then, the remaining three parameters of Wu's fundamental diagram are fitted on each branch using a least-square fit. This method is shown to be robust for cases tested in real life, and hence very noisy, data. Subject Fundamental diagramfittingfreewaywave speedfree-flow speedcapacity dropcalibration To reference this document use: http://resolver.tudelft.nl/uuid:47904720-785b-4a0d-b51d-b8a1da527d77 DOI https://doi.org/10.1080/21680566.2016.1256239 Embargo date 2018-02-28 ISSN 2168-0566 Source Transportmetrica B: Transport Dynamics Part of collection Institutional Repository Document type journal article Rights © 2016 V.L. Knoop, W. Daamen Files PDF knoop_TMB.pdf 3.14 MB Close viewer /islandora/object/uuid:47904720-785b-4a0d-b51d-b8a1da527d77/datastream/OBJ/view