Fundamental Diagram Estimation Through Passing Rate Measurements in Congestion
Classically, fundamental diagrams are estimated front aggregated data at a specific location. Such a measurement method may lead to inconsistency, which mainly explains 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, the passing rate is independent of the traffic flow states. This property allows 1) proof that a linear fundamental diagram is suitable to represent traffic flow behavior involved in the Next Generation Simulation (NGSim) data set and 2) fitting of its two parameters, i.e., the congested wave speed and the jam density.
Keywords: Equilibrium traffic state ; fundamental diagram (FD) ; macroscopic ; Next Generation Simulation (NGSim) ; passing rate ; traffic flow theory ; Kinematic Waves ; Traffic Flow ; Highway ; Models ; INRETS
Record created on 2010-11-05, modified on 2016-08-08