It passes through Mount Compass, until it reaches Hindmarsh Valley, on the northern fringes of Victor Harbor.

[3] From Old Noarlunga the road originally ran southeast to McLaren Vale, then straight south to Willunga,[citation needed] before climbing the Willunga Escarpment with a steep, winding narrow section called 'Willunga Hill'.

After ascending the new 'Willunga Hill', the road levels and rejoins its old route, gently descending to the town of Mount Compass.

Due to its local notoriety, the road has had significant works since early 2004, with resurfacing, overtaking lanes, increased police attention and the reduction of speed limits.

Due to this, driver impatience was a regular occurrence, and was the cause of a number of crashes at the location.

Stage 2 is currently under construction, which entails duplicating the road to the McLaren Vale intersection.