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Longer bridges can reduce the width of both shoulders to 4 feet (1.2 m). Existing bridges can remain part of the Interstate system if they have at least 12-foot-wide (3.7 m) lanes with 3.5-foot (1.1 m) shoulder on the left and a 10-foot (3.0 m) shoulder on the right, except that longer bridges can have 3.5 feet (1.1 m) shoulders on both sides.
The method of assigning numbers differs from one state to the next but provides a unique number for each bridge in the state. [3] The bridge inventory is developed for having a unified database for bridges, including the identification information; bridge types and specifications; operational conditions; and bridge data including geometric data ...
Other lists of U.S. bridges. By height; By state; By city Boston; New York City; Pittsburgh; Portland, Maine; Portland, Oregon; Seattle; Cable-stayed bridges; Covered bridges; List of toll bridges § United States; Category:Lists of bridges documented by the Historic American Engineering Record; Category:Lists of bridges on the National ...
Printable version; Page information; Get shortened URL ... Map of the United States with states labeled by their abbreviations. ... Blank_US_Map.svg. Date: 5 June ...
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The Pershing Map FDR's hand-drawn map from 1938. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916, which provided $75 million over a five-year period for matching funds to the states for the construction and improvement of highways. [8]
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.
Length (mi) [5] [b] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes US 1: 2,369: 3,813 Fleming and Whitehead streets in Key West, FL: Route 161 at Canadian border in Fort Kent, ME: 1926: current Follows the East Coast of the United States, longest north-south US Highway US 2: 2,112: 3,399