The Ports-To-Plains Corridor, also known as National Highway System High Priority Corridor 38, is a highway corridor between the United States Mexico border at Laredo, Texas and Denver, Colorado. It is the southern third of the Ports-to-Plains Alliance. The reason for proposed improvements to this corridor is to expedite the transportation of goods and services from Mexico in the United States and vice versa. The Ports-To-Plains Corridor starts in South Texas and traverses through Texas, New Mexico, Oklahoma, and ends in Denver, Colorado.