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The objective of this dissertation is to evaluate the impacts of the Sistema Viário Oeste, an important intervention in the road network of Bahia (Brazil), on the spatial distribution of economic activity and accessibility. In order to evaluate the project's impacts on economic activity, we integrated an interregional computable general equilibrium model specially designed for impact analysis in the State of Bahia to the road network of the National Plan of Logistics and Transport. We then estimated the percentage reduction in inter-regional transport costs, the relevant variable for integrating the road network to the general equilibrium model, based on simulations on the road network and a freight cost function. Three results from this analysis can be highlighted. First, variations in economic activity are significantly more intense in the State of Bahia. Second, within the State of Bahia the South, South-Central mesorregions and Metropolitan Mesorregion of Salvador are the ones that most benefit from the Sistema Viário Oeste. This expansion occurs at the expense of regions located in the northern part of the State. The aforementioned regions accrue less significant positive gains or even losses in economic activity. Third, the project has significant spillover effects, given that at least 30% of the increase in real output due to the operation of the project benefits regions outside the State of Bahia. Aiming at evaluating the impact of the Sistema Viário Oeste on accessibility, we calculated four accessibility indexes: the locational accessibility index and three potential accessibility measures. We then performed three distinct analyzes over the calculated indexes. First, we evaluated the impact of travel time reductions on the spatial distribution of accessibility. As a result of this analysis, we found that the benefits generated by the Sistema Viário Oeste accrue mostly to regions in the State of Bahia. Within the state, the most heavily impacted municipalities are those located in the South-Central and South Bahia. Second, we analyzed the impacts of the Sistema Viário Oeste on accessibility inequality. This analysis shows, in general terms, the increase in regional inequality in the distribution of accessibility, signaling the increased inequality in the spatial distribution of location advantages arising from the possibilities of interaction. Third, we undertook an analysis rarely made in studies of this nature. We recalculated the accessibility indices using the estimates of the impacts on gross domestic product derived from general equilibrium simulations. In this analysis, we evaluated the impacts of activity changes resulting from the Sistema Viário Oeste over the accessibility indices. In this perspective, we observe that change in economic activity is relevant for the explanation of accessibility growth only in regions mildly affected by the decrease in travel time. Furthermore we found that changes in activity have no impact on the inequality analysis undertaken.

Avaliação dos impactos espaciais do sistema viário oeste-Bahia: uma abordagem a partir de índices de acessibilidade e da modelagem de equilíbrio geral computável