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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.
State Route 90 (SR 90) is a state highway in the U.S. state of California that consists of two unconnected pieces in Greater Los Angeles.. Most of the western portion of SR 90 is the Marina Freeway, a short freeway in southwestern Los Angeles and the nearby suburbs, linking Marina del Rey to the rest of Greater Los Angeles.
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.
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 ...
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