Shillong: Ri Bhoi administration issued alternate routes on August 21 amid the blockade of the Byrnihat-Jorabat road.Travellers from Shillong, Nongpoh and Byrnihat heading to Guwahati airport or railway stations can use Byrnihat–Pillingkata–Killing or Nongpoh–Patharkhmah–Rani.Those travelling from Guwahati to Shillong can take Basistha–Pillingkata–Killing or Rani–Patharkhmah–Mairang.The administration urged commuters in Assam and Meghalaya to avoid the Jorabat–Byrnihat…