Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Federal Highway 9 (Spanish: Carretera Federal 9, Fed. 9) is a toll-free part of the federal highway corridors (Spanish: los corredores carreteros federales). It crosses the center of Nuevo León, from Allende, Nuevo León to Cadereyta, Nuevo León. It has a length of 38 km (24 mi).