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Highways in the United States

¡TThe United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. __1__ these wide modern roads are generally __2__ and well maintained, with few sharp curves and __3__ straight sections, a direct route is not always the most __4__ one. Large highways often pass __5__ scenic areas and interesting small towns. Furthermore, these highways generally __6__ large urban centers which means that they become crowded with __7__ traffic during rush hours, __8__ the "fast, direct" way becomes a very slow route. However, there is almost always another route to __9__ if you are not in a hurry. Not for from the relatively new "superhighways", there are often older, __10__ heavily traveled roads which go through the countryside. __11__ are good lane roads; others are uneven roads curving __12__ the country. These secondary routes may go up steep slopes, along hilly cliffs or down frightening hillsides to towns __13__ in deep valleys. Though these are less __14__ routes, longer and slower, they generally go to places __15__ the air is clean and the scenery is beautiful, and the driver may have a chance to get a fresh, clean view of the world.