This study argues that the modernization of the Federal Highway No. 5 Mexicali - San Felipe has impacted over social benefits of 10 localities. Despite that the works have not been concluded in all the extension of the highway, the Urban Marginal Indexes are estimated at their ex – before (2000) and ex – post (2010). It is observed that the 2 localities connected directly with the road have decreased their marginalized situation considerably, as well as the other 5 localities interconnected through the secondary network. The remaining 3 have not been benefited due of their poor accessibility within the secondary network. It can be concluded that accessibility is the key factor that improves their socioeconomic conditions over time.
Key words: Urban marginal index, road infrastructure, evaluation ex - before and ex - post, localities, basic geostatistical area.
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