The Kodaikanal Ghat Road has been designated by the Tamil Nadu State Highway Department as SH-156. It begins at 10°9′10″N 77°41′30″E / 10.15278°N 77.69167°E on the Grand Southern Trunk Road (NH-45), about 8 kilometres (5.0 mi) west of Batlagundu and ends at Kodaikanal with a length of 56.8 kilometres (35.3 mi).
Toll House on the Kodai Ghat Road.
The Road is tolled by the Kodaikanal Municipality.
The road was strengthened at a cost of 60 million in 2009. A retention wall was later built due to a landslide.
The Road was used as an alternative when the Adukkam-Periakulam and Adukkam-Perumalmalai ghat roads were shut due to excessive damage.
In 2010, the road was completely blocked after a major landslide occurred due to heavy rainfall.
In 2011, four people were killed when a car plunged into a gorge.