Ahh yes Ray,
The shingle road.
I learned to drive on them and they seem to be a thing that a lot of tourists here have a hard time negotiating, especially if they've just been graded.
The key is to keep your speed down and don't make any sudden movements with the steering wheel.
Keeping your wheels in the two un-shingled paths, will keep you from going into the shingled mounds either side of these paths.
Striking these at speed can cause serious "fish-tailing" and consequent loss of control of the vehicle.
I nearly rolled a Fire Service tanker carrying 5000 litres of water on a road like this one night, it is not an experience I'll ever forget. [Linked Image]