{"id":1498,"date":"2021-08-30T11:00:15","date_gmt":"2021-08-30T11:00:15","guid":{"rendered":"https:\/\/open-traffic.epfl.ch\/?p=1498"},"modified":"2021-08-30T11:03:38","modified_gmt":"2021-08-30T11:03:38","slug":"empirical-observations-of-multi-modal-network-level-models-insights-from-the-pneuma-experiment","status":"publish","type":"post","link":"https:\/\/open-traffic.epfl.ch\/index.php\/2021\/08\/30\/empirical-observations-of-multi-modal-network-level-models-insights-from-the-pneuma-experiment\/","title":{"rendered":"Empirical observations of multi-modal network-level models: Insights from the pNEUMA experiment"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"625\" src=\"https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-1024x625.png\" alt=\"\" class=\"wp-image-1499\" srcset=\"https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-1024x625.png 1024w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-300x183.png 300w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-768x468.png 768w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-370x226.png 370w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-770x470.png 770w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-760x464.png 760w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32-740x451.png 740w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/Screenshot-2021-08-30-at-09.06.32.png 1128w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>After an amazing collaboration with the group of Dr. Ludovic Leclercq at Univ. Gustave Eiffel, a new paper was published in Transportation Research Part C: Emerging Technologies entitled &#8220;Empirical observations of multi-modal network-level models: Insights from the&nbsp;<em>pNEUMA<\/em> experiment&#8221;.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Highlights<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>Multimodal regressions are defined for mean speed with respect to accumulations or stop durations (two-fluid models).<\/li><li>A Macroscopic traffic states analysis comes from an unprecedented complete trips database from pNEUMA Experiment in Athens.<\/li><li>A two-stage trip-based&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/engineering\/macroscopic-model\">macroscopic model<\/a>&nbsp;is proposed to enhance traffic modelling at urban regional scale.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Abstract<\/h4>\n\n\n\n<p><em>Multi-modal interactions at the network-level remain unexplored due to the lack of high-resolution data for all transportation modes involved. The current work investigates the effect of&nbsp;multi-modal&nbsp;interactions at space-mean network speed for each mode using the dataset from&nbsp;pNEUMA&nbsp;experiment that was carried out in a congested city centre network of Athens, Greece. Explanatory variables considered are the accumulation and the stopped fraction of vehicles of each mode. Firstly, a multi-modal mean speed MFD is considered by assuming that the mean speed of each mode can be expressed in terms of accumulations of all modes. The quality of multi-modal MFD fits is compared to the uni-modal ones, where the mean speed of a given mode is assumed to be a function of the accumulation of that mode only. Secondly, the classical two-fluid model is extended to multi-modal networks. An analysis on the ergodicity assumption in the context of stopped fraction is also presented. This work also introduces a network-level dynamic model that uses the stopped fraction of vehicles. This so-called extended trip-based model simulates the stop-and-go pattern of the vehicles thereby reproducing the evolution of network congestion. This work is the first to explore in this direction. The results from the classical trip-based and the extended trip-based models are compared and validated with the empirical data.<\/em><\/p>\n\n\n\n<p>You can read the paper <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0968090X21003090#f0035\">here<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"653\" src=\"https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-1024x653.jpg\" alt=\"\" class=\"wp-image-1501\" srcset=\"https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-1024x653.jpg 1024w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-300x191.jpg 300w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-768x490.jpg 768w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-1536x980.jpg 1536w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-2048x1306.jpg 2048w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-370x236.jpg 370w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-760x485.jpg 760w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-1520x969.jpg 1520w, https:\/\/open-traffic.epfl.ch\/wp-content\/uploads\/2021\/08\/1-s2.0-S0968090X21003090-gr3_lrg-740x472.jpg 740w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>After an amazing collaboration with the group of Dr. Ludovic Leclercq at Univ. Gustave Eiffel, a new paper was published in Transportation Research Part C: Emerging Technologies entitled &#8220;Empirical observations&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[72],"tags":[74,85,84,73],"class_list":["post-1498","post","type-post","status-publish","format-standard","hentry","category-publications","tag-journal","tag-mfd","tag-multi-modal","tag-publication"],"_links":{"self":[{"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/posts\/1498","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/comments?post=1498"}],"version-history":[{"count":5,"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/posts\/1498\/revisions"}],"predecessor-version":[{"id":1505,"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/posts\/1498\/revisions\/1505"}],"wp:attachment":[{"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/media?parent=1498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/categories?post=1498"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/open-traffic.epfl.ch\/index.php\/wp-json\/wp\/v2\/tags?post=1498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}