Kahekili Highway
Not including this in the official "Maui Sights" area, because it's just a video we've found. But this should give you a pretty good idea of what the Kahekili Highway is like on Northwest Maui. The bad parts are in relatively shot segments, and the portion around 1:40 into this video are what we find to be the worst. One additional segment near the end is also a little intimidating. But driving clockwise is a MUST when taking this route. Below is the video. A few more we've taken (much shorter) are below.
Location: Kahekili Highway is located in the
Northwest Maui Region