40) also called the Carretera Interoceánica (Interoceanic Highway), is a road beginning at Reynosa, Tamaulipas, just west of the Port of Brownsville, Texas, and ending at Fed.

It is called Interoceanic as, once finished, the cities of Matamoros, Tamaulipas, on the Gulf of Mexico and Mazatlán on the Pacific Ocean will be linked.

It passes through Monterrey, Nuevo León; Saltillo, Coahuila; Torreón; Gómez Palacio and Durango City.

[citation needed] Parallel to this highway, in some sections, runs Fed.

[6] From Reynosa, Tamaulipas, to La Junta, Nuevo León, the roadway is a 4-lane divided unrestricted access road.

40 continues as a 2-lane undivided road, passing through several small towns including: From Monterrey, Nuevo León, to Saltillo, Coahuila, Fed.

The highway crosses the northern end of the Sierra Madre Oriental that divides Coahuila and Nuevo León.

Both roads merge again in the town of 28 de Agosto and begin another section of 4-lane divided unrestricted highway.

A few kilometers ahead is the road junction south to Parras de la Fuente.

30 to San Pedro, which eventually becomes a 4-lane divided unrestricted road and leads directly to northern Torreón.

Torreon, Coahuila, and Gómez Palacio, Durango, form a metro area.

When going eastbound, Mazatlán to Durango, after reaching the top of the Sierra Madre Occidental, Fed.

In addition to being a boon to travel and commerce between Durango and Sinaloa and points beyond, authorities expected enhanced security in the region due to quicker access and mobility of the military.

The new highway, known officially as Autopista Durango-Mazatlán, was finished in 2012, and inaugurated by President Enrique Peña Nieto on October 17, 2013.

[7] The route passes through and over the Sierra Madre Occidental by way of 63 new tunnels totaling nearly 18 km (11 mi) in length, and 115 new bridges, eight of which are over 270 m (890 ft) high.