Urban Form and the Environmental Impact of Commuting in a Segregated City, Santiago de Chile

Abstract

The literature on the relationship between the built environment and travel has identified population density and the mix of land uses as key characteristics of the urban form that affect travel patterns. However, in cities with strong sociospatial disparities it is not clear if these characteristics apply in the same way. In this paper we use regression analysis to estimate the influence of the spatial growth pattern of Santiago, Chile, on the environmental impact of commuting. Our findings can be summarized in three points: The travel impact increases as the city spreads out because of the monocentric nature of Santiago; the environmental impact of commuting could be reduced by containing commuters within the area where they live; and the use of public transport reduces the impact, but the modal choice depends not only on the effectiveness of the transport system but also on the characteristics of the urban form and other socioeconomic determinants. Consequently, we propose to reorient the growth pattern in three ways: redirecting land-use policy to promote development within the already built area, developing compact areas where residential and economic activities are mixed, and facing sociospatial disparities as a way to encourage the use of public transport. This would reduce the environmental impact of commuting while, at the same time, tackling sociospatial segregation.