During winter, this works just fine. Yakutsk is the coldest town on earth, with January temperatures averaging around -40 degrees, and the rest of the area isn't much better. Such temperatures seal up and harden the dirt into a very neat, tarmac-like structure that drivers can cruise over at a relatively cool 45 mph.
The problem is that the highway is also used during summer, when temperatures can reach up to 90 degrees and rainfall is abundant. And the river that runs alongside the road is extremely prone to flooding. And this isn't some remote roadway -- every summer, hundreds upon hundreds of vehicles venture the road (because, you know, there are no alternatives), only to get stuck in traffic jams that continue for days on end.
"OK, so who are we eating first?"
In deepest Siberia.
With all the cars slowly sinking.