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So, I-5 runs north-south along the west coast, while I-10 runs east-west in the south. The major transcontinental routes are:
When an interstate hits a major urban area, beltways around the city carry a three-digit number. These routes are designated with the number of the main route and an even-numbered prefix. To prevent duplication within a state, prefixes go up. For example, if I-80 runs through three cities in a state, routes around those cities would be I-280, I-480 and I-680. This system is not carried across state lines, so several cities in different states can have a beltway called I-280. When I-95 hits metropolitan Washington, D.C., coming from the south, it becomes the famous Beltway (as in the political expression "inside the Beltway") that circles the city, signed I-495. North of the metro area, when the two circumferential highways rejoin, it becomes I-95 again. There is also a system for numbering interstate interchanges, also known as exits. States do this numbering and can choose between two methods:
Cool Facts About the Interstate System
Is there any rhyme or reason to how U.S. interstate highways are numbered?Yes, there is. But first you need to know a little about the interstate highway system. Known officially as the Dwight D. Eisenhower System of Interstate and Defense Highways, this massive federal road-building project began in the late 1930s. But it wasn't until 1952 that Congress authorized spending and construction began. In 1956, uniform construction standards were adopted, governing such things as access, speeds, number of lanes, width of lanes and width of shoulders. Standards were also established for numbering the routes:
So, I-5 runs north-south along the west coast, while I-10 runs east-west in the south. The major transcontinental routes are:
When an interstate hits a major urban area, beltways around the city carry a three-digit number. These routes are designated with the number of the main route and an even-numbered prefix. To prevent duplication within a state, prefixes go up. For example, if I-80 runs through three cities in a state, routes around those cities would be I-280, I-480 and I-680. This system is not carried across state lines, so several cities in different states can have a beltway called I-280. When I-95 hits metropolitan Washington, D.C., coming from the south, it becomes the famous Beltway (as in the political expression "inside the Beltway") that circles the city, signed I-495. North of the metro area, when the two circumferential highways rejoin, it becomes I-95 again. There is also a system for numbering interstate interchanges, also known as exits. States do this numbering and can choose between two methods:
Cool Facts About the Interstate System
Does an alternate route that travels around the city begin with an even number?An alternate route that travels around the city begins with an even number. The solid yellow line on any roadway should be on the driver's left. Interchanges take the place of intersections on expressways.
How many lanes do expressways have going in one direction?An expressway is a four-lane divided highway with partial access control. You will experience intersections, but not entrances. You may also encounter pedestrians and slow-moving vehicles, and maybe even interchanges.
Are installed on the side of the road to alert drivers who drift off the road?Rumble strips are installed as a low-cost safety countermeasure that can reduce single-vehicle run-off-road (SVROR) and cross-center line crashes. Rumble strips, whether center line, edge line, or shoulder, alert inattentive or drowsy motorists whose vehicles have drifted out of their travel lane.
How fast should a motorist enter an expressway?You are entering an expressway, and are in the acceleration lane. You should speed up to the flow of traffic on the expressway by using the length of the acceleration lane. When entering an expressway, your car's speed should match the speed of traffic on the expressway.
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