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Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67. Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle.
Bridge weight plates refer to SBI numbers instead of posted route numbers as well. For example, bridge plates along old US-66 refer to the route as "SBI-4" When the United States Numbered Highway System was started in 1926, the US numbers were just tacked onto the existing IL/SBI number unless the US Route was routed along a new route.
Within the route log, "U.S. Route" is used in the table of contents, while "United States Highway" appears as the heading for each route. All reports of the Special Committee on Route Numbering since 1989 use "U.S. Route", and federal laws relating to highways use "United States Route" or "U.S. Route" more often than the "Highway" variants.
Serves Chicago; Formerly designated as City US Route 20 City US 30 — — — — 1959: 1960 Served Aurora: US 30 Bus. — — — — 1960: 1970 Served Aurora; Formerly designated as City US Route 30 US 30 Toll — — Aurora: Ford Heights — — US 30 Alt. — — — — 1942: 1971 Served Chicago; Formerly designated as US Route 330 US 40 ...
In 1918, Wisconsin became the first state to number its highways in the field followed by Michigan the following year. [1] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (United States Numbered Highways), selecting the best roads in each state that could be connected to provide a national network of federal highways.
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
It was altered further in 1927 in order to accommodate numbers in the United States Numbered Highway System. [citation needed] In 1935 the Ohio General Assembly passed a law which added 5,000 miles of roads to the state highway system over a 12-month period. [7] [8] These roads were assigned route numbers in the 500s, 600s, and 700s. [9]
The Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (ISTHA), and Skyway Concession Company (SCC) are responsible for maintaining these highways in Illinois. The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2,248.93 miles (3,619.30 km). [2]