Laboratoire dingenierie circulation transports

Vaulx-en-Velin, France

Laboratoire dingenierie circulation transports

Vaulx-en-Velin, France
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Richard O.,Laboratoire dingenierie circulation transports | Richard O.,University of Lyon | Constans S.,Laboratoire dingenierie circulation transports | Constans S.,University of Lyon | And 2 more authors.
Transportation Planning and Technology | Year: 2011

The current air traffic system faces recurrent saturation problems. Numerous studies are dedicated to this issue, including the present research on a new dynamic regulation filter holding frequent trajectory optimisations in a real-time sliding horizon loop process. We consider a trajectory optimisation problem arising in this context, where a feasible four-dimensional (4D) trajectory is to be built and assigned to each regulated flight to suppress sector overloads while minimising the cost of the chosen policy. We model this problem with a mixed integer linear programme and solve it with a branch-and-price approach. The pricing sub-problem looks for feasible trajectories in a dynamic three-dimensional (3D) network and is solved with a specific algorithm based on shortest path labelling algorithms and on dynamic programming. Each algorithm is tested on real-world data corresponding to a complete traffic day in the European air traffic system; experimental results, including computing times measurement, validate the solution process. © 2011 Taylor & Francis.


El Faouzi N.-E.,Laboratoire dingenierie circulation transports | El Faouzi N.-E.,INRETS | El Faouzi N.-E.,University of Lyon | De Mouzon O.,Laboratoire dingenierie circulation transports | And 6 more authors.
Advances in Transportation Studies | Year: 2010

A better understanding of the effects of weather on traffic and more specifically adverse weather events is fundamental for road operations. Recognizing this need advances in sensor technologies enabling real time monitoring of roadways and environmental conditions offer nowadays ways to create better decision support tools for road managers. In this respect a comprehensive analysis of the impact of weather conditions on motorway traffic flow is undertaken. This paper offers a synthesis of four complementary studies, conducted for the assessment of the weather effect on traffic flow and safety. More precisely, this work reports studies that focused on assessing the impact of rain on road traffic operations. An important innovative aspect of this work is that traffic data are recorded (some are individual, others are aggregated) simultaneously with weather and surface data from a road weather information system (RWIS). Then, an in-depth analysis of the effect of weather (rain occurrence) is conducted on the most relevant parameters used for assessing performance of traffic operations and traffic risk characterisation (speed, headway, traffic composition and platooning).

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