Vittorio Astarita
Dept. of Territorial Planning - University of Calabria
Vincenzo Punzo, Vincenzo Torrieri
Dept. of Transportation Engineering - University of Napoli “Federico II”

9th Meeting of the Euro Working Group on Transportation, Bari, Italy, June 2002.

Abstract

In this paper a before-after study is presented for the case of a new road infrastructure opening. The network of the city of Pozzuoli (a small network, often over-saturated during peak hours) has been modified completely in 2000 by the opening of a new by-pass fast road, that attracts most of the traffic before loading the historical centre. The study is a comparison between a classical analytical static model and a micro-simulation model. The two models have been calibrated and applied to two different scenarios using data collected before the road construction. After the road opening the forecasts made with the two models have been compared with the new traffic flows and travel time data gathered. The data collected have been used also to recalibrate the o/d matrix both with a static and a dynamic approach used for new simulations. Both the used approaches were able to establish the utility of the new construction, but with micro-simulation it has been possible to reproduce the within day evolution of the traffic and to obtain a better estimate of the o/d travel times. Moreover, as expected, the dynamic model provided more reliable results by using a time varying series of o/d matrices.

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