This highway would have to have been quite an engineering feat, and difficult to build. Breathtaking and majestic, the road rears 6,500 feet in 21km and has 93 bends.
However, beware this is a dangerous road to travel especially after sunset. You will travel this road on your way to Al Hada from Jeddah.
A lot of the drivers on the road were overtaking on blind spots and generally speeding, so be careful.
Al Hada is located in the Taif Mountains at an altitude of 6000ft (1800m). At this altitude, oxygen is less readily available and new arrivals will normally feel somewhat short of breath, especially when exercising, climbing stairs or carrying heavy burdens.
These symptoms will subside spontaneously with acclimisation in a few days. Decrease smoking, don't overeat and drink plenty of fluids.