Suhua Highway Improvement Project

A portion of the original alignment was built alongside very steep cliffs high above the Pacific Ocean.

Because of the rugged terrain, it was often closed due to heavy rain, typhoons, or landslides, leading to injuries and deaths.

The improved highway has a speed limit of 60 kilometres per hour (37 mph), lower than a freeway, and still has only one lane in each direction.

Some parts of the old alignment was kept open for bicycles and small vehicles, with a speed limit of 30 kilometres per hour (19 mph).

Due to difficulties in construction,[4] the project was finally completed in 2020 at a cost of 55.17 billion New Taiwan dollars.