U.S. 90 Business in New Orleans was designated as a part of Future Interstate 49 in 1991 by federal legislation. Kam Movassaghi, secretary of the state Department of Transportation and Development (LADOTD), requested federal officials in May 1999 to formally label both U.S. 90 Business in New Orleans and along the Westbank Expressway as part of Interstate 49 as well as a section of U.S. 90 freeway from Raceland to Berwick. Federal officials rejected the two requests in September 1999 because neither were connected to the existing Interstate 49. Instead officials offered to make the New Orleans segment a spur of I-10 until I-49 is extended.2
The Interstate 910 designation came to fruition when it was approved by AASHTO on October 1, 1999, but it was not signed. The October 31, 2002, Interstate Route Log and Finders List, published by the Federal Highway Administration, revealed that the Interstate 910 designation is official on its Auxiliary Routes page with 9.70 miles.
Subsequent actions by LADOTD for I-910 from an January 2003 email indicated that signing the route was still a possibility:3
The signing of the Westbank Expressway as I-910 is still on hold due to the inclusion of this section of highway in the Future I-49 Corridor. The Department is about to initiate work on an Environmental Impact Statement for 37 miles west of the Westbank Expressway. At the conclusion of that study, we will be in a better position to determine how to proceed.
Since that time, the Interstate 910 designation remains unsigned and no further plans to post it were announced. As originally envisioned, I-49 South will extend southeastward from Lafayette to Morgan City, east to Houma and east northeast to the Westbank Expressway and New Orleans. The east end is not set in stone however, as I-49 South may instead turn northward at Boutte and overtake Interstate 310 to end at I-10 by Kenner. Should that be the case, I-910 may remain indefinitely in place along U.S. 90 Business.