The official federal-government highway to Yakutsk, and it is also the only one to get there. This can turn into a major humanitarian disaster during rainy spells, when the usual clay covering of the road turns into impassable mud blanket, swallowing trucks and tractors alike.
Here is an aerial shot of this road in winter:
There are also rumors of a quite normal 30 km stretch of Russian country road, which gets an unexplained amount of car accidents; the locals suspect underground gas seepage which causes motorists to fall asleep... This creepy tale is supported by the evidence of car crash statistics and the tales of survivors, who do not remember anything prior to the crash and act strangely "drugged" afterwards. Hopefully this will be properly investigated before the road claims more victims.