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When the original state highway system was created in 1921, it was designated as part of State Route 1, which followed the Jefferson Highway auto trail.
At the time, the main route between New Orleans and Baton Rouge was the Jefferson Highway, an auto trail which followed the modern River Road past Garyville.
When the Jefferson Highway auto trail was designated in 1916, Clay Cut and Hope Villa Roads became part of the new road (there is now another Claycut Road in Baton Rouge, located south of the present-day LA-73).
LA 942 carries what was once a small piece of the Jefferson Highway auto trail, designated in 1916, which became the original Louisiana Highway 1 in 1921.
LA 4 was a numbering of the auto trail named the Dixie Overland Highway, a route that spanned from San Diego to Georgia.