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Simulation of the illegal double parking: quantifying the traffic and pollutant impacts

Lookup NU author(s): Dr Fabio Galatioto, Professor Margaret Carol Bell CBE


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In many cities around the world illegal parking is a common occurrence, often caused by deliveries to shops alongside roadside parking and double parking near commercial activity. Case studies and research in Boston (USA), Parma (Italy), Rio de Janeiro (Brazil) investigated the frequency of occurrence of illegal parking behaviour depending on vehicle type. Illegal parking affects traffic flow especially in terms of causing congestion, increasing delays and creating queues. As a consequence it contributes to the elevation of pollutant concentrations in urban areas. This paper reports on a study of the effects of illegal parking in an urban area of Palermo. A site where there is an high frequency of illegal double parking occurring was identified. A micro-simulation model was set-up, calibrated and validated using measured traffic parameters and available second by second emissions factors. Confident that the micro-simulation model was able to characterise double parking a set of different illegal double parking situations were designed, modelled and from the simulated outputs the environmental and traffic impacts were analysed. This study demonstrated that the DRACULA (Dynamic Route Assignment Combining User Learning and microsimulAtion) successfully modelled Italian characteristics and the illegal double parking phenomenon through a statistical representation of the location along the road, the duration and frequency of occurrence of illegal parking incidents based on direct observation over a period of six months. It was clear that the illegal parking was governed by the commercial activities along the street. Impacts were quantified not only qualitatively but quantitatively and included impacts relating to traffic (such as length of queues, capacity) and the environment (in terms of vehicle emissions). The results showed how illegal double parking increasing congestion, delays and creating queues. Finally, two short-term inexpensive and a medium to long term strategy that would reduce the occurrence of illegal parking and consequential effects, are presented.

Publication metadata

Author(s): Galatioto F, Bell MC

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: IV International SIIV Congress

Year of Conference: 2007

Pages: 12