In the late 1990s, the Arizona Department of Transportation began widening US 93 to four lanes, in some areas building a completely new roadway; in other places, simply repaving the old highway and building two new lanes parallel to it.
In the late 1990s the Arizona Department of Transportation began widening US 93 to four lanes, and in some areas building a completely new roadway. In other places along the route, ADT simply repaved the old highway and built two new lanes parallel to it.