Erebus Highway (1) - Sol 529

"...We're making some real progress at Meridiani. Our little jog to the North revealed a good southward route on the eastern side of Purgatory Dune, so that's what we went for.
Since then we've been making steady southward progress and as of now we're almost 90 mt south of Purgatory.
Driving in this stuff is an interesting challenge. We are literally in a maze. The easiest going is to stay within the troughs between the ripple crests, which run roughly North-South.
So the best way to make southward progress is to follow a trough until it peters out (to peter out--->esaurirsi), make a "lane change" to a nearby trough and continue onward.
But then there's the issue of the "Erebus Highway". This is a stretch of light-toned terrain that we've seen from orbit, and that we're guessing may have some exposed bedrock in it that'll make for easier going...".