sentences:  From Old Noarlunga the road originally ran southeast to McLaren Vale then straight south to Willunga, before climbing the Willunga Escarpment with a steep, winding narrow section called 'Willunga Hill'.In the 1970s a diversion was constructed, bypassing McLaren Vale and Willunga to the west through the McLaren Vale vineyards, and including a new 4-lane section climbing the Willunga Escarpment of the Mount Lofty Ranges.The steep winding ascent of the old road (now known as 'Old Willunga Hill' to differentiate it from the newer road) is regularly featured as part of cycling events such as the Tour Down Under due to its challenging climb.