Times Based on Geo-Coding (with Time Variation Solely due to Road Construction and Improvement) We use geo-coding to create time varying estimates of travel times between firms’ localities and major Mexican metropolitan areas in each 5-year interval during our sample period 1993–2013. The first step involves producing cross-sectional variation on travel times between localities at the end of our sample period . To do so, the calculation makes use of the 2014 digital GIS road network provided by INEGI. We combine the road network with data on average truck speeds