The Interstate Highway system is still being expanded. Various plans have been proposed:
Interstate 3
Interstate 3, the Third Infantry Division Highway, was proposed in the 2005 highway funding bill () to run from Savannah, Georgia west to Knoxville, Tennessee. The legislated number is I-3, which does not fit into the Interstate Highway numbering system. The number was chosen to honor the United States Army Third Infantry Division.
Interstate 9
Interstate 9 has been proposed by Caltrans for California State Route 99 in central California, from the split with I-5 north to Stockton (where it would turn west on SR 4 to end at I-5).
Interstate 14
Interstate 14 has included in the 2005 highway funding bill (), to run from Natchez, Mississippi east to Augusta, Georgia. Further extensions might take it west to Austin, Texas and east to Myrtle Beach, South Carolina.
Interstate 22
- Main article: Interstate 22
Interstate 22 is the planned number for US 78 between Memphis, Tennessee and Birmingham, Alabama. Most of the freeway has been built. Signage will be installed designating it as a "Future" Interstate in 2006, and completion is expected by 2011.
Interstate 41
The Interstate 41 number was assigned to present US 41 between Milwaukee, Wisconsin and Green Bay, Wisconsin in the 2005 highway funding bill ().
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