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There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers.
Main Roads was able to provide work for the unemployed throughout the 1930s in road construction. Large groups of men spent one or two weeks in camps, constructing roads. With the outbreak of World War II in 1939, a smaller labour force undertook works for Main Roads, which were primarily for military purposes, such as aerodromes and parade ...
Identification of these main roads was completed in 1923. [ 1 ] The American Association of State Highway Officials (AASHO), formed in 1914 to help establish roadway standards, began to plan a system of marked and numbered "interstate highways" at its 1924 meeting. [ 20 ]
The system includes 4% of the nation's roads, but carries more than 40% of all highway traffic, 75% of heavy truck traffic, and 90% of tourist traffic. [2] All urban areas with a population of over 50,000 and about 90% of America's population live within 5 miles (8.0 km) of the network, [2] which is the longest in the world. [9]
In North American and Australian English, major roads such as controlled-access highways or arterial roads are often state highways (Canada: provincial highways). Other roads may be designated "county highways" in the US and Ontario. These classifications refer to the level of government (state, provincial, county) that maintains the roadway.
The Department of Transport and Main Roads (TMR), is a department of the Queensland Government. TMR was formed in April 2009 by merging Queensland Transport and the Department of Main Roads . [ 1 ] TMR manages Queensland's 33,000 km state road network, which includes 3,100 bridges.