Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System...

primary interstate highways. This number does not include auxiliary Interstate Highways. In addition to the 48 contiguous states, Interstate Highways are...

are auxiliary Interstate Highways (designated by three-digit numbers) in varying stages of planning and construction, and the planned expansion of existing...

Interstate 115 (I-115) is a 1.194-mile-long (1.922 km) auxiliary Interstate Highway which connects I-15/I-90 to Butte in the U.S. state of Montana. The...

Interstate 585 (I-585) is a 2.25-mile-long (3.62 km) auxiliary Interstate Highway of I-85 in the US state of South Carolina. It is an orphan auxiliary...

The Interstate Highways in Georgia comprise seven current primary Interstate Highways and eight auxiliary Interstates. In addition, two primary Interstates...

The Interstate Highways in Massachusetts comprise five current primary Interstate Highways and eight auxiliary Interstates. In addition, two auxiliary Interstates...

is a list of Interstate Highways in Maryland. There are currently 16 Interstate Highways that exist entirely or partially in the U.S. state of Maryland...

four primary interstate highways and eight auxiliary highways, with a ninth proposed, totaling 1,497.58 miles (2,410.12 km) interstate miles in Florida...

Interstate 505 (I-505) is a north–south auxiliary Interstate Highway in the Sacramento Valley in Northern California. It is a spur auxiliary route of...

Interstate 189 (I-189) is an auxiliary Interstate Highway in Chittenden County, Vermont. The spur extends for 1.49 miles (2.40 km) from I-89 exit 13 in...

The Interstate Highways in Virginia are a total of 1,118 miles (1,799 km) of Interstate Highways in the U.S. state of Virginia. Virginia consists of six...

currently seven routes in the Interstate Highway System that are signed with letter suffixes to the route number. Interstate 35 (I-35) splits into I-35E...

Interstate 780 (I-780) is an east–west auxiliary Interstate Highway in the San Francisco Bay Area of Northern California. It runs from Curtola Parkway...

Interstate 294 (I-294) is a tolled auxiliary Interstate Highway in the northeastern part of the U.S. state of Illinois. Forming the southern portion of...

Interstate 225 (I-225) is an auxiliary Interstate Highway in the U.S. state of Colorado. The freeway is a 11.959-mile-long (19.246 km) connector spur route...

Route 238, consisting of State Route 238 (SR 238) and Interstate 238 (I-238), is a mostly north–south state and auxiliary Interstate highway in the San Francisco...

are 31 Interstate Highways—9 main routes and 22 auxiliary routes—that exist entirely or partially in the U.S. state of New York, the most of any state...

Interstate 605 (abbreviated I-605, officially known as the San Gabriel River Freeway) is a 27-mile-long (43 km) major north–south auxiliary Interstate...

Interstate 410 (I-410), colloquially Loop 410, is an auxiliary route of I-10 around San Antonio, Texas. It is identified as the Connally Loop in honor...

I-470 is one of 13 auxiliary Interstate Highways in Ohio and the only auxiliary Interstate Highway in West Virginia. The western terminus of I-470 is an...

The list of Interstate Highways in Pennsylvania encompasses 23 Interstate Highways—12 primary routes and 11 auxiliary routes—which exist entirely or partially...

Interstate 380 (I-380) is a short 3.3-mile (5.3 km) east–west auxiliary Interstate Highway in the San Francisco Bay Area of Northern California, connecting...

2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration...

auxiliary Interstate Highways List of special routes of the United States Numbered Highway System List of business routes of the Interstate Highway System...

The Interstate Highways in Washington are segments of the national Interstate Highway System that lie within the U.S. state of Washington. The system comprises...

There are 11 Interstate Highways—5 primary and 6 auxiliary—that exist entirely or partially in the U.S. state of South Carolina. As of December 31, 2013...

Interstate 184 (I-184) is a short auxiliary Interstate Highway in Boise, Idaho, United States. It is a spur route of I-84 that connects the freeway to...

2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration...

maintaining these highways in Illinois. The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2...