Question

why railway crossing is built on the road of railway tracks
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Answer 1

A level crossing is an intersection where a railway line crosses a road or path, or in rare situations an airport runway, at the same level,[1] as opposed to the railway line crossing over or under using an overpass or tunnel. The term also applies when a light rail line with separate right-of-way or reserved track crosses a road in the same fashion. Other names include railway level crossing,[1] grade crossing,[2] road through railroad, criss-cross, railroad crossing, train crossing, and RXR