Down to no center line Continuing with the theme of becoming increasingly narrow as we drive east, here's a shot of the Piilani highway about 8 miles west of Kaupo. Note how it is basically 1.5 lanes wide - but still very nicely paved.
This image is from the presentation "A Hawaiian Kaleidoscope - Maui: Haleakala Climb and Downhill Cycle Descent, Snorkeling".