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The Border Roads Organisation (BRO), a tri-service organisation of the Defence Ministry specializing in road and bridge construction in difficult terrains, had initially estimated that the tunnel would be ready for vehicle flow by 2015 (Tunnel Border Roads Organisation (BRO)), a tri-service organisation of the Defence Ministry specializing in road and bridge construction in difficult terrains, had initially estimated that the tunnel would be ready for vehicle flow by 2015 (Tunnel BRO) had initially estimated that the tunnel would be ready for vehicle flow by 2015 (Tunnel BRO)