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Pavement sloping: On straight sections of the highway, the roadway is to have a cross slope of at least 1.5%, and preferably 2% to ensure proper drainage, with up to 2.5% in areas of heavy rainfall. The cross slope of both the left and right shoulders should be between 2% and 6%, but not less than the main lanes.
Caltrans has proposed I-7 or I-9 for SR 99 in central California I-8: 171.98: 276.77 Nimitz Boulevard, Sunset Cliffs Boulevard in San Diego: I-8 at the Arizona state line 1964: current Westernmost segment between Nimitz Boulevard/Sunset Cliffs Boulevard and I-5 is not officially recognized as an Interstate by the FHWA: I-9: 302: 486 I-5 at ...
The state highway system of the U.S. state of California is a network of highways that are owned and maintained by the California Department of Transportation (Caltrans).. Each highway is assigned a Route (officially State Highway Route [1] [2]) number in the Streets and Highways Code (Sections 300–635).
Interstate 80 in San Francisco: Interstate 280 and 5th Street in San Francisco: 1969: current Unconstructed SR 480 — — US 101 in San Francisco: I-80 in San Francisco: 1968: 1991 Originally planned as I-480. Demolished in 1991. SR 710: 1.3 [f] 2.1 California Boulevard in Pasadena: I-210 / SR 134 in Pasadena: 1984: current
In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the ...
Cross slope and lane width affect the safety performance of a road. Certain types of crashes, termed "lane departure crashes", are more likely on roads with narrow lanes. These include run-off-road collisions, sideswipes, and head-on collisions. For two-lane rural roads carrying over 2000 vehicles per day, the expected increase in crashes is:
The segment signed as California SR 15 from I-5 to I-8 in San Diego is planned to be redesignated as part of I-15 once this segment is completely upgraded to Interstate standards, namely where the freeway's interchange with SR 94 is concerned. The interchange currently has left-exits and blind merges, and is due to be updated with a long ...
I-70 briefly follows an at-grade portion of US 30 with traffic lights in Breezewood, Pennsylvania. There are gaps in the Interstate Highway system, where the roadway carrying an Interstate shield does not conform to the standards set by the Federal Highway Administration (FHWA), the body that sets the regulations for the Interstate Highway System.