We made this drive from Caraz to Trujillo a few weeks ago; it was gorgeous but terrifying. I was too busy "helping" Scott drive to take pictures :D but this woman showed it really well--see her 8th August entry:
http://latinamericaroadtrip.wordpress.com/2013/09/25/peru-12-leaving-the-cordillera-blanca-for-trujillo-and-the-north-and-on-to-the-border-with-ecuador/
