The current modal share between highway and railroad in freight land transportation in Mexico is presented. Based on available origin and destination (O-D) data, the most important origin and destination points of freight transportation by both modes are identified. Information is also provided on the multicommodity flows taking place in Mexico. The O-D information and network assignment analyses are used to establish the major Mexican land transport corridors and their characteristics. The possible extension of these corridors to the U.S. road and railroad corridors that are more important for the binational trade is indicated. Data about the recent evolution of this trade are presented. Only freight transportation is discussed.