September 2007 saw a large number of landslides in these hills(in Darjeeling&Sikkim).The lifeline to Sikkim -NH 31 A, however brought to normal but still faces trouble in restoring it.Every half kilometer is with a big or small land/rock slips,making the travel to and fro from Sikkim and Siliguri troublesome.Traffic congestion and jams are a common sight .The two hour journey from Rangpo to Siliguri now take three hours ,depending on your luck and patience.
