The road to the west side of Jökulsá river is road 862. It has a gravel surface and is passable by all cars to Dettifoss. However, there is no winter maintenance on it yet. It is easy to get to Vesturdal from road 862.
From Dettifoss and further south to the national road 1, the road is gravel but without winter maintenance from January 1st to March 30th. Dettifoss is part of the Diamond Ring, see it here www.demantshringurinn.is
The road to the east side of Jökulsá river in the mountains is road 864. It is a mountain road that is only open in summer and is passable by all cars, but drivers need to adjust their speed to the condition of the road each time.
The price list at the campsite is complicated, so it is not certain that the calculated price is correct