The location mentioned in the article is actually quite far from Al-Quaa, on Razeen Rd.
Here is another spot referenced on Google maps and easily accessible by road : « AL Quaa Milky way Spot »
Unnamed Road - Abu Dhabi
https://goo.gl/maps/7X9jqFxJeJaL1kwT6
In this area especially, it’s not recommended to venture off-road if you’re not an intermediate level driver - and of course, never alone, at least 3 cars. The sabkhas, not only the dunes, might be a danger : they look perfectly harmless, because all flat, but you can get stuck after a few hundred meters with no obvious reason. It almost happened to me once in this area.