Regensburg 2010 – scientific programme
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SOE: Fachverband Physik sozio-ökonomischer Systeme
SOE 3: Traffic Dynamics, Urban and Regional Systems II
SOE 3.1: Talk
Monday, March 22, 2010, 10:15–10:30, H44
Towards a non-equilibrium statistical physics for mobility on road networks — •Bazzani Armando1, Rambaldi Sandro2, and Marchioni Monica3 — 1University of Bologna, INFN, Bologna, Italy — 2University of Bologna, INFN, Bologna, Italy — 3University of Bologna, Bologna, Italy
New communication technologies allow to record dynamical microscopic data on large social systems. In Italy single vehicle trajectories are monitored by a GPS system for insurance reason. The data concern 2% of the whole vehicle population and the trajectories are sampled at a spatial scale of 2 Km. Recent studies of Florence urban area[A.Bazzani et al "Statistical Laws in Urban Mobility from microscopic GPS data in the area of Florence" submitted for publication 2009] have pointed out that in the average the GPS data represent an urban mobility that can be described by an ergodic principle based on the existence of a "mobility energy" for the daily mobility paths and by a Benford's law for the activity downtime distribution. To enrol the system complexity is then necessary to study transient states out of equilibrium, like, for instance, the rise of congestion phenomena. In this work we analyze the GPS data recorded on the whole Emilia-Romagna region during November 2007 to look for congestion effects and their evolution. We propose to describe the congestion dynamics by using the instant velocity and the trajectories of the monitored vehicles. We consider also the behavior of some selected drivers that are used to move in the considered area.