just avoid Transalpina & Transfagarasan during weekends (friday to sunday) because of high traffic -> 2-3 hours waiting or just crawling with 20km/h
...When exactly do you intend to have the trip? I am from Bucharest, but starting with September 9th, I will be nearby Transfagarasan (on the north side of the mountains).
...The sign you are showing has yellow background, which means it applies only to a section of road that is under construction and another sign will tell you when that section ends.
Glad you enjoyed it! I expected you to like it, but I am very surprised to hear you think our drivers are any good