The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.
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 I-280 in San Bruno to US Route 101 (US 101) near San Francisco International Airport. The highway primarily consists of only three intersections: I-280, State Route 82, and US 101. Like the nearby I-280, I-380 never connects to I-80, its parent Interstate Highway. However, there is no rule that says that spur routes need to do so.
Interstate 180 (I-180) is a 1.09-mile-long (1.75 km) expressway in the US state of Wyoming between I-80 and downtown Cheyenne.
Interstate 291 (I-291), also known as the Springfield Expressway, is a 5.44-mile (8.75 km) auxiliary Interstate Highway in Massachusetts that links I-91 in downtown Springfield with I-90 in Chicopee. I-291 is roughly a northeast–southwest highway. It merges with I-91 at its southwestern terminus, via a flyover. The road meets the turnpike at its northeastern terminus. Getting onto the turnpike from I-291 is straightforward, but getting from the turnpike to I-291 requires a left turn at an at-grade traffic signal. I-291 travels directly through highly populated areas of Springfield and passes under several overpasses. From its southwestern terminus to exit 5A, I-291 is concurrent with US Route 20 (US 20).
Interstate 110 (I-110) is a 4.1-mile (6.6 km) freeway spur route in Biloxi, Mississippi, running south from I-10 to U.S. Route 90 (US 90). It is one of very few places on the Interstate Highway System utilizing a drawbridge. The southbound control city is Biloxi, with a series of bridges out over the Gulf of Mexico at the southern terminus. There is no northbound control city; the road is marked with trailblazers reading "TO I-10" instead. It ran entirely concurrently with Mississippi Highway 15 (MS 15), until MS 15 was truncated to I-10.
Interstate 190 (I-190) is a 19.26 miles (31.00 km) auxiliary Interstate Highway in the US state of Massachusetts, maintained by the Massachusetts Department of Transportation (MassDOT). Spanning approximately 19 miles (31 km) along a south–north axis, it is a spur route of I-90 in Central Massachusetts. However, its southern terminus exists at its split from I-290 in Worcester, which itself splits from the turnpike in Auburn. Its northern terminus lays at an interchange with Route 2 in Leominster.
Interstate 235 (I-235) in Kansas is a 16.52-mile-long (26.59 km) north–south bypass spur route of I-35 that travels through the western part of Wichita. Its northern terminus is at an interchange with I-135/U.S. Highway 81 (US-81)/K-15/K-96/K-254 north of the city, where the freeway continues east as K-254. The southern is at I-135/US-81 shortly before US-81 separates from I-135 and I-135 connects to I-35 at I-135's own southern terminus.
Interstate 564 (I-564) is an Interstate Highway in the US state of Virginia. Known as Admiral Taussig Boulevard, after US Navy Rear Admiral Edward D. Taussig, the Interstate runs 3.03 miles (4.88 km) from State Route 337 (SR 337) east to I-64 within the city of Norfolk. I-564 is the primary access highway to Naval Station Norfolk, the world's largest naval base. The Interstate also links I-64 with Norfolk International Terminals via SR 406 and the Wards Corner area of Norfolk through connections with U.S. Route 460 (US 460) and SR 165.
Interstate 391 (I-391) is an auxiliary Interstate Highway located entirely within the US state of Massachusetts. It runs from the I-91/I-391 interchange in Chicopee to the center of Holyoke, a distance of about 4.46 miles (7.18 km). It runs near the Connecticut River throughout its journey in Chicopee, crosses into Holyoke, and abruptly ends at High Street 0.4 miles (0.64 km) south of U.S. Route 202 (US 202).
County Route 66 is an east–west numbered road in San Bernardino County, California, United States. It runs for 175.7 miles (282.8 km) from Oro Grande to the U.S. Route 95 (US 95) at Arrowhead Junction. The entire route is part of the former U.S. Route 66 (US 66), connecting towns that were bypassed by Interstate 40 (I-40) such as Oro Grande and Amboy. It is the only numbered county route in San Bernardino County.
