Route
NH 166H runs 53 km from Miraj, Maharashtra to Ishwarpur, Maharashtra.
Crosses Maharashtra.
Through Miraj, Sangli, Ashta and Ishwarpur.
Why it matters
NH 166H is a branch of NH 166. In the national highway numbering used since 2010, a letter after the number marks a spur or link off the main route — this one runs Miraj to Ishwarpur, and it meets NH 166 along the way.