Nairobi-Nakuru Highway
It seems like drivers enjoy going down the road and pretending it is a racetrack. Aside from that, drunk driving is not rare on this highway. In a single year alone, 320 people have died here.
Transfagarasan Road
Many people drive on this road if they want to take a shortcut between Walachia and Transylvania. What makes it so difficult is that the oxygen falters a lot. You should expect to get altitude sickness as well.