Finding a route across the mountains and then building a road across to the grasslands to the west was a very big thing in 1813-1815. The western point of the road before descending the escarpment is at Mount York.
They had lots of trouble getting down to the plains below with various roads being built over time, each trying to improve on the steep descent.
At Mount York there is a collection of old monuments celebrating the centenary and other milestones. There is also very interesting modern signage explaining the history. A short bush walk (which I didn't do on this occasion) also takes you to historic cuttings from the first road.