From Kulob we only had to cross one mountain pass before arriving on the valley of the Panj river, the border between Tajikistan and Afghanistan. There is hardly any difference between both sides, the most striking ones are heavy traffic and huge road construction sites (by Chinese companies) on the Tajik side.
There is also the occasional Las Vegas style amusement park on the Tajik side.
Due to the bad road conditions and lots of traffic it took us 12 hours to make the 400 kilometers to Khorog, which is the beginning of the high altitude part of the Pamir highway.