This is a historic road that is now unmaintained and suitable for 4WD vehicles only. There are a number of bridges and two hand dug tunnels along the route. The track is cut into the side of the gorge and is several metres above the water level. There are a lot of steep drop-offs along the route. The area is prone to slips and washouts. The route can be very muddy in places after rain. Mud tyres and 3 vehicles recommended.
Be sure to stop at the Whangamomona Hotel at the start or end of your trip and make a donation to the road maintenance fund.
It is worth giving the hotel a call before heading into the area - make sure the track is actually open.