In this system, the two highways running northward from Cameron on either side of Calcasieu Lake had different numbers. The westerly route from Cameron through Sulphur to DeRidder was Route 104, while the easterly route through Creole toward Lake Charles was the southern leg of Route 42, a much longer route that was co-signed with US 171 as far as Mansfield.
In this system, two highways branching off from Cameron near Calcasieu Lake had different designations. The westerly path from Cameron to DeRidder was designated Route 104, while the easterly route through Creole toward Lake Charles was a part of a longer Route 42 that shared responsibility with US 171 until Mansfield.