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An underground passage is a road constructed beneath the ground to allow people and vehicles to cross streets safely. These passages are mainly built under roads, railways, or buildings. Companies such as Underground Passage, along with those specializing in bridges and road signs, are engaged in the design and construction of such structures. During construction, concrete, metal, and other durable materials are used. Underground passages provide safe crossing for pedestrians in cities and help regulate traffic. These companies work based on government contracts and provide high-quality services in accordance with standards.
