rocks a constant threat, the cliffside Suhua Highway was regarded as one of the most dangerous in the world. Nonetheless, it remained the main transport link between eastern and northern Taiwan, until the completion of the North-Link Line railway in 1980. In the 1980s the northern portion of the highway was widened again to facilitate two-way traffic; construction was completed in 1990.

Calls for improvements of the dangerous highway gained urgency in 2010 after