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Type I—Roads are paved or have an all weather surface and have grades that are negotiable by a normal touring car. These roads are usually narrow, slow speed, secondary roads. Type II—Roads require high-clearance vehicles such as trucks or 4-wheel drives. These roads are usually not paved, but may have some type of surfacing.
Through urban areas, at least one routing is to have 16-foot (4.9 m) clearances, but others may have a lesser clearance of 14 feet (4.3 m). Sign supports and pedestrian overpasses must be at least 17 feet (5.2 m) above the road, except on urban routes with lesser clearance, where they should be at least 1 foot (30 cm) higher than other objects.
Behind the scenes, the federal aid program had begun with the passage of the Federal Aid Road Act of 1916, providing 50% monetary support from the federal government for improvement of major roads. The Federal Aid Highway Act of 1921 limited the routes to 7% of each state's roads, while 3 in every 7 roads had to be "interstate in character ...
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.
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]
Dwight Eisenhower, then a 28-year-old brevet lieutenant colonel, [12] accompanied the trip "through darkest America with truck and tank," as he later described it. Some roads in the West were a "succession of dust, ruts, pits, and holes." [11] As the landmark 1916 law expired, new legislation was passed—the Federal Aid Highway Act of 1921 ...
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
Segments connected by road through Yellowstone National Park: US 90: 1,633: 2,628 I-10 in Van Horn, TX: SR A1A in Jacksonville Beach, FL: 1926: current Follows the Gulf Coast of the US US 91: 163: 262 I-15, I-84 in Brigham City, UT: US 26 southwest of Idaho Falls, ID: 1926: current US 92: 177: 285 I-175, I-375, SR 687 in St. Petersburg, FL