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An Underground Passage is a tunnel built to allow pedestrians to cross under a road safely. These passages separate vehicular traffic from pedestrians, thereby preventing accidents. Underground Passages are usually constructed on large or busy avenues, or near shopping centers. These structures typically feature lighting, stairs, and sometimes ramps. The construction, maintenance, and repair of Underground Passages are handled by specialized companies such as "Crossings, Bridges, and Road Signs." These companies work in both construction and maintenance services.