The highway was completely rebuilt, starting in 1989, to its modern form. The reconstruction reduced the maximum grade from 11% to 8% and re-graded the switchbacks to be on level ground to eliminate the blind corners.
A significant upgrade of the highway started in 1989, resulting in its current form. This renovation reduced the steepest slope from 11% to 8% and flattened out the switchbacks to eliminate the sharp corners that posed a hazard.