Route
NH 183A runs 173 km from Vandiperiyar, Kerala to Karunagapally, Kerala.
Crosses Kerala.
Through Vandiperiyar, Chittar, Pathanamthitta, Adoor and Karunagapally.
Why it matters
NH 183A is a branch of NH 183. 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 Vandiperiyar to Karunagapally, and it meets NH 183 along the way.