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In page Louisiana Highway 2:

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LA 2 Alt. is an anomaly in the current state highway system, being the only special state route designated in the 1955 renumbering and the only "Alternate" state route.[a][4] Its route has seen only one major change, the relocation of its western terminus from Sykes Ferry to Shongaloo in the early 1970s.[5][6] The intervening route was assumed by LA 2, which was re-routed through Webster Parish at this time, shortening LA 2 Alt. by 5.0 miles (8.0 km).