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There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower ...
Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System.The 323 auxiliary routes generally fall into three types: spur routes, which connect to or intersect the parent route at one end; bypasses, which connect to the parent route at both ends; and beltways, which form a circle that intersects the ...
Shortest state highways by state State Highway mi km References Alabama: State Route 151: 0.404 0.650 [1] Alaska: Route 98: 13.4 21.6 [2] Arizona: State Route 90 Spur: 0.420 0.676 [3] Arkansas: Highway 369: 0.196 0.315 [4] California: State Route 77: 0.353 0.568 [5] Colorado: State Highway 110: 0.186 0.299 [6] Connecticut: Connecticut Route 78: ...
Interstate 37 near San Antonio, TX: 1926: current Intrastate, Texas only; AASHTO says the northern terminus is at the northern end of I-37 US 183: 1,035: 1,666 US 77 in Refugio, TX: I-90 west of Presho, SD: 1930: current US 185: 124: 200 Casper, WY: Cheyenne, WY: 1926: 1934 Intrastate, Wyoming only; replaced by US 87: US 187: 207
Primary Interstates are assigned one- or two-digit numbers, while shorter routes (such as spurs, loops, and short connecting roads) are assigned three-digit numbers where the last two digits match the parent route (thus, I-294 is a loop that connects at both ends to I-94, while I-787 is a short spur route attached to I-87). In the numbering ...
There are a combined 1,673 miles (2,692 km) of Interstate Highways within New York, which handles about 19 percent of vehicle travel in New York. [2] At approximately 0.50 miles (0.80 km), I-78 is the shortest main Interstate Highway, while I-90 is the longest, spanning 385.88 miles (621.01 km) within New York.
The top five most dangerous interstates include: I-4: With an average of 34.0 fatal crashes per 100 miles, I-4, located solely in Florida, stretches over 130 miles, and connects major cities like ...
The shortest mainline Interstate Highway in Tennessee is I-55, at a length of 12.28 miles (19.76 km) in Memphis. The longest auxiliary Interstate Highway in Tennessee is I-840 , an outer southern bypass around Nashville, at a length of 77.28 miles (124.37 km).