Unidirectional ante only one direction lo operation. Rail cum road bridge unidirectional ke use chestaru onlyfrom Rajamundry to Kovvur.
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Bi directional means it's used running for both up and down train traffic..Ante ikkada RJY nunchi Kovvur vaipu, malli Kovvur nunchi RJY vaiypu. Arch Bridge renditiki use chesthaaru.
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Rail...
more... cum Road bridge chaala chaala rare ga Kovvur-Rajamundry run use chestaru. Mundulo use chesevaaru ippudu ledu ala.