| 31. | The 1955 renumbering of the state's highway system.
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| 32. | Since the renumbering, LA 47 has been extensively improved and reconstructed.
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| 33. | The renumbering completely altered the previously existing state highway numbers.
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| 34. | The route remained in this form until the 1955 Louisiana Highway renumbering.
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| 35. | Route 69 also remained in effect until the 1955 renumbering.
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| 36. | After a realignment and renumbering it follows its current course.
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| 37. | LA 304 was created in the 1955 Louisiana Highway renumbering,
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| 38. | LA 309 was created in the 1955 Louisiana Highway renumbering,
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| 39. | LA 317 was created in the 1955 Louisiana Highway renumbering,
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| 40. | LA 339 was created in the 1955 Louisiana Highway renumbering,
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