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Elevators and well-constructed and maintained ramps allow for independent use by persons who use wheelchairs or scooters, and by others who cannot use stairs. They are also used by the general public, easing the way for those with children in strollers or with shopping carts. Platform lifts are permanently installed elevating devices designed to transport wheelchair users on a platform that moves vertically between levels. Platform lifts usually require a key for operation. Entry and operation is often restricted to minimize misuse of the device.
New construction is required to be accessible to persons with disabilities or use ramps or elevators to overcome changes in levels in a manner that provides equal access. Platform lifts often leave barriers to aide persons with disabilities, and accessible portable or permanent ramps may be required.
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Nebraska is roughly rectangular, except in the northeast and the east where the border is formed by the irregular course of the Missouri River and in the southwest where the state of Colorado cuts out a squared corner. The land rises more or less gradually from 840 ft (256 m) in the east to 5,300 ft (1,615 m) in the west. The great but shallow Platte River, formed in W Nebraska by the junction of the North Platte and the South Platte, flows across the state from west to east to join the Missouri S of Omaha. The Platte and the Missouri, together with their tributaries, give Nebraska all-important water sources that are essential to farming in this agrarian state. Underground water sources are also widely used for irrigation. The river valleys have long provided routes westward, and today the transcontinental railroads and highways follow the valleys.
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