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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.
For designation as a National Scenic Byway a road must have one of six intrinsic qualities. To be designated an All-American Road, a road must have at least two of the six qualities. [5] Scenic quality is the heightened visual experience derived from the view of natural and manmade elements of the visual environment of the scenic byway corridor ...
genista, flickr Travelers hitting the road this summer may want to do their research first: Reader's Digest recently announced their list of the best, worst, and deadliest roads in America.
Australia defines minimum vertical clearance based on types of roads. The minimum vertical clearance is 5.4 metres (17 ft 9 in) for main roads and highways, and 4.6 metres (15 ft 1 in) for other local roads with road authority approval. For high and very high clearance roads, the values are between 5.9 metres (19 ft 4 in) and 6.5 metres (21 ft ...
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]
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Interstate 15 in the Ivanpah Valley. Northbound, Interstate 15 makes a steep descent from Mountain Pass into the Ivanpah Valley.In the middle distance, the casinos of Primm straddle the freeway right at the Nevada border, while those of Jean are further off, to the left; Las Vegas is immediately on the far side of the hills on the horizon.