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The AASHO road test was to study the performance of pavement structures of known thickness under moving loads of known magnitude and frequency. [citation needed] The study was carried out from August 1956 to November 30, 1960 in Ottawa, Illinois [2] and has been used as a primary source of experimental data when vehicle wear to highways is ...
The pavement condition index ( PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section. The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service ...
The international roughness index ( IRI) is the roughness index most commonly obtained from measured longitudinal road profiles. It is calculated using a quarter-car vehicle math model, whose response is accumulated to yield a roughness index with units of slope (in/mi, m/km, etc.). [1] [2] Although a universal term, IRI is calculated per ...
Standard Illinois route markers System information Maintained by IDOT, ISTHA, and CDOT Formed November 5, 1918 (1918-11-05) Highway names Interstates Interstate X (I-X) US Highways U.S. Route X (US X) State Illinois Route X (IL X) System links Illinois State Highway System Interstate US State Tollways Scenic The Illinois Routes are the highways in the State Highway System of the U.S. state of ...
Illinois State Bond Issue Route 4 was the first numbered through route between Chicago and St. Louis, as shown on the 1924 Illinois Road Map. As such it was the forerunner of more famous routes US 66 and Interstate 55. In 1926, a new alignment for Route 4 was opened between Joliet and Lyons, on the north side of the Des Plaines River.
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year: the year of the map, listed at the Illinois Digital Archives and Illinois Department of Transportation; link: to link the department name as author; c-link: to link the cartographer where it appears as the second author in years where H.M. Gousha or Rand McNally did the cartography work for the state. section: to indicate the map section ...
Highway markers for Interstate 57, U.S. Route 45, Illinois Route 1 and the Chicago Skyway Overall map of system: freeways in light blue, tollways in green, other highways in yellow System information Maintained by IDOT, ISTHA, and SCC Formed November 5, 1918 (1918-11-05) Highway names Interstates Interstate X (I-X) US Highways U.S. Route X (US X) State Illinois Route X (IL X) System links ...