The costs of congestion can be measured using three approaches: the total costs, the marginal costs and the ‘excess burden’. Understanding variation in these measures with particular policies is important for planning and resource management. Assessing the cost distribution (e.g. according to priority routes or urban segments) is key to assessing the delivery of transport and wider social objectives. The aim of this research is to illustrate how the costs of congestion vary with policy-related demand changes around the city of Milan. The case study used is the “Cerchia dei Bastioni” (called for administrative purposes Area C), an old urban area within the inner centre of City of Milan network, with a ‘real life’ charging policy applied to private vehicles. A large number of scenarios with differing demand levels and elasticity’s by vehicle classes were explored and equilibrium assignment used to assign demand to the network. Alternative measures for congestion costs were calculated along with other link parameters. Further data collection included a parallel field survey of changes in PT speed was also undertaken. The results indicate a high degree of correlation between changes in the different measures of congestion and changes in vehicle speed (at different levels of demand). Changes in the total cost of congestion are though more marked than changes in the Excess Burden of Congestion. Sub-optimal conditions appear to exist in certain parts of the network which it is conjectured arise as a consequence of the configuration of the network – in terms of one way streets and vehicle restrictions. Identifying a more optimal network is left for further research, as is identifying the precise conditions for which vehicle speeds can be used as a proxy for changes in congestion.

SENSITIVITY ANALYSIS OF TRAFFIC CONGESTION COSTS IN A NETWORK UNDER A CHARGING POLICY

MUSSONE, LORENZO;
2013

Abstract

The costs of congestion can be measured using three approaches: the total costs, the marginal costs and the ‘excess burden’. Understanding variation in these measures with particular policies is important for planning and resource management. Assessing the cost distribution (e.g. according to priority routes or urban segments) is key to assessing the delivery of transport and wider social objectives. The aim of this research is to illustrate how the costs of congestion vary with policy-related demand changes around the city of Milan. The case study used is the “Cerchia dei Bastioni” (called for administrative purposes Area C), an old urban area within the inner centre of City of Milan network, with a ‘real life’ charging policy applied to private vehicles. A large number of scenarios with differing demand levels and elasticity’s by vehicle classes were explored and equilibrium assignment used to assign demand to the network. Alternative measures for congestion costs were calculated along with other link parameters. Further data collection included a parallel field survey of changes in PT speed was also undertaken. The results indicate a high degree of correlation between changes in the different measures of congestion and changes in vehicle speed (at different levels of demand). Changes in the total cost of congestion are though more marked than changes in the Excess Burden of Congestion. Sub-optimal conditions appear to exist in certain parts of the network which it is conjectured arise as a consequence of the configuration of the network – in terms of one way streets and vehicle restrictions. Identifying a more optimal network is left for further research, as is identifying the precise conditions for which vehicle speeds can be used as a proxy for changes in congestion.
WCTR13 Selected Proceedings
9788528502329
Traffic congestion; Large urban network; Excess Burden of Congestion; Charging Policy; Public Transport
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/796318
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