Have done this route many times by car - but would avoid it during the winter months - As Steve (A!)says, lots of landslides and very dodgy ! But in the summer months the road is usually better and as long as you are careful its not that bad any more. (that comes from a woman who has her eyes screwed tightly shut for most of the journey !!). Not for the faint hearted !!! Lots of beautiful mountain meadows on the way up, perfect for a picnic.