Fundamental diagram estimation through passing rate measurements in congestion
CHIABAUT ; BUISSON ; LECLERCQ
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
CHIABAUT ; BUISSON ; LECLERCQ
Résumé / Abstract
Classically, fundamental diagrams are estimated from aggregated data at a specific location. Such a measurement method may lead to inconsistency which mainly explain the current controversy about their shape. This paper proposes a new estimation method based on passing rate measurements along moving observer paths. Under specific assumptions, it can be proved that in congestion passing rate is independant of the traffic flow states. This property allows (i) to prove that a linear fundamental diagram is suitable to represent traffic flow behavior involved in the Next Generation Simulation Model (NGSIM) dataset; (ii) to fit its two parameters: the congested wave speed and the jam density. Finally, simulations of vehicle trajectories are carried out with Newell's simplified car-following model to test the estimated fundamental diagram. It is found that the estimated parameters provide accurate vehicle trajectories.
Editeur
TRB
