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Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles (4,862 km). It begins in Seattle, Washington , and travels through the Pacific Northwest , Mountain West , Great Plains , Midwest , and the Northeast , ending in Boston , Massachusetts.
Former termini are not shown if they are along the current route, meaning that the route was simply extended. One Interstate Highway—Interstate 305—is defined only federally; the state calls it part of US 50. It was signed as part of Business Interstate 80, the only state-maintained Interstate business route in California.
I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway. Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion.
The "0" in its route number indicates that US 20 is a major coast-to-coast route. Spanning 3,365 miles (5,415 km), it is the longest road in the United States, [1] and, in the east, the route is roughly parallel to Interstate 90 (I-90), which is the longest Interstate Highway in the U.S.
Longest State Highway in California SR 2: 87.295 [b] [c] 140.488 Centinela Avenue in Santa Monica: SR 138 near Wrightwood: 1934: current SR 3: 146.369 [b] 235.558 SR 36 near Peanut: Ball Mountain Little Shasta Road in Montague: 1964: current SR 4: 197 [b] 317 I-80 / San Pablo Avenue in Hercules: SR 89 near Markleeville: 1934: current SR 7: 6.718
Under the code, the state assigns a unique Route X to each highway and does not differentiate between state, US, or Interstate highways. California still uses a version of the 1961 U.S. Route shield, featuring a simplified cutout shield containing only the outer border, "U S," and the route marker. All other U.S. states adopted the 1971 version ...
[a] This is a list of the longest state highways in each state. As of 2007, the longest state highway in the nation is Montana Highway 200, which is 706.624 miles (1,137.201 km) long. The shortest of the longest state highways is District of Columbia Route 295, which is 4.29 miles (6.90 km) long.
Longest route within a single country by joining partial roads. Not a straight single road. Asian Highway 2: 13,177 km (8,188 mi) Asia: Denpasar, Indonesia: Khosravi, Iran: Broken up by Bali Strait, Java Sea, and Karimata Strait. Trans-Siberian Highway: 11,000 km (6,800 mi) Russia: St. Petersburg: Vladivostok: Longest non-loop route within a ...