Abstract

TRB 2014 - 93rd Transportation Research Board Annual Meeting, WASHINGTON DC, ETATS-UNIS, 12-/01/2014 - 16/01/2014; The travel time variability may significantly influence the driver's route choice. Estimating travel time reliability is thus really appealing to urban infrastructure managers. This could provide better information to drivers, encourage their reassignment on the network, and optimize its use. In this paper, we study any arterial in under-saturated conditions with known fixed-time traffic signals. The kinematic wave model is chosen to simply represent traffic dynamics. A semi-analytical (grid-free) method is applied to determine the separation between vehicle groups at each signal of the arterial. The main contribution of this paper is to present an aggregated diagram that describes the functioning of this arterial. It graphically provides the direct assessment of vehicle travel times with respect to their departure and the traffic flow. This tool only depends on signal settings and is cyclic and invariant for fixed-time signals. We show how to use this diagram to generate probabilistic travel time distributions when some input parameters are uncertain. Furthermore, this diagram appears insightful when the traffic flow is not accurately known.

Abstract

Managed lanes operations refer to multiple strategies for recurring congestion control by increasing the road capacity or adapting its configuration to the demand level. As a result, the evaluation of their impacts usually focuses on congestion or safety-related indicators. However, with the growing prosperity, consumers demand higher quality transport services, for which reliable transport networks are central. This paper is focused on the travel time reliability assessment of a managed lane experience from a French motorway. The paper shows results from the field test experience of the hard shoulder dynamic use on the A4-A86 motorway in the east of Paris. Further to the reliability assessment, the paper focuses on the reliability indicators. It particularly shows the weakness of the skew of the distribution of travel time indicator.; La gestion dynamique des voies fait appel à de multiples stratégies pour maîtriser les congestions récurrentes, ce en accroissant la capacité de la route ou en adaptant sa configuration à la demande. Ces stratégies sont donc logiquement généralement évaluées en termes d'impacts sur la fluidité ou la sécurité du trafic, impacts mesurés par des indicateurs. Cependant, avec la prospérité croissante, les consommateurs demandent une amélioration de la qualité de service pour laquelle la fiabilité des réseaux de transport est centrale. Cette communication porte sur l'évaluation de la fiabilité des temps de parcours résultant d'une expérimentation de gestion dynamique des voies sur une autoroute en France - le tronc commun A4-A86, à l'est de Paris. La bande d'arrêt d'urgence y a été ouverte à la circulation à certaines périodes de la journée. Les résultats de cette expérimentation sont donnés ici ; à la lumière de ces résultats notamment, les indicateurs de fiabilité sont ensuite discutés. On montre en particulier la faiblesse de certains indicateurs fondés sur la largeur ou la dissymétrie de la distribution des temps de parcours. Document type: Conference object