Avaliação do desempenho da segurança viária “antes” e “depois” da implantação semafórica em interseções de Fortaleza

Abstract

Road safety is a major concern in the transportation sector, since most of the interventions on urban roads has a direct relation with this phenomenon. Traffic accidents bring serious costs to society because they cause high social and economic losses. In urban areas, it can be said that the implementation of traffic signal is a major actions that takes place in order to prevent possible accidents at intersections. To evaluate the necessity of the installation of a traffic light is possible to identify some criteria decision-making, and the number of accidents one of the major. However, it is necessary to examine more carefully the behavior of these occurrences of accidents, since in some cases it is possible that occurs the natural reduction in the number accidents on site without the realization of the intervention motivated only by random phenomenon or other factors not controlled in experiment. This monograph evaluates the impact of the implementation of urban traffic signal intersections in Fortaleza through a study of the "before" and "after" simple and comparison groups. The accidents analyzed in the study consist of a collection held at 66 intersections in the city of Fortaleza between the years 2004 and 2011 by the engineering division of the agency responsible for the city traffic. The results point to the effectiveness of the installation of traffic light a way to reduce the occurrence of accidents at intersections, and presented a average reduction of 45%.