Speed Limit Reduction and Traffic Crashes: Empirical Evidence from São Paulo


Several cities worldwide have taken throughout the years actions to implement reduced speed limits in urban areas. The rationale for lowering speed limits in urban areas is supported by the literature indicating that a reduction in average travel speed is associated not only with a decline in accident severity but also with lower crash risk. Following this trend, the municipality of Sao Paulo started in 2014 with an intervention to implement speed limit reductions in selected areas of the city, particularly in those with high incidence of traffic crashes. Since then, São Paulo has reduced the speed of more than 900km of roads and has witnessed a substantial reduction in the number of crashes and traffic-related fatalities.

There is a vast literature shedding light on the correlation between speed, crashes and fatalities. However, few studies are able to successfully measure the impact of a given speed reduction, isolating the effect of lower speed limits from that of other confounding factors. The purpose of this research project is to provide robust empirical evidence on the causal relationship between the speed limit reductions and traffic crash risk in the case of the municipality of São Paulo.

Ano de Conclusão/Year of Conclusion: 
Em andamento/In Progress
Co-pesquisadores associados/Co-Associated Researchers: 
<p>Lycia Lima; Luis Alvarez; Jo&atilde;o Manoel Cardoso de Mello</p>
Ver as publicações desta pesquisa