Sichuan province is known for its high seismic activity, and the highway traverses an area devastated by a 7.9 magnitude earthquake in 2008 that killed tens of thousands of people, a disaster blamed in part on poor construction.
The sudden collapse has raised concerns over the quality of China’s construction and whether sufficient geological surveys were carried out. Local authorities are attempting to downplay the incident, describing it as an isolated natural event.
It comes only months after another major accident, when a railway bridge under construction in Qinghai province collapsed in August, killing at least 12 workers.
Completed in January, the Hongqi bridge was part of China’s broader strategy to spur economic growth in poorer mountainous regions, intended as a symbol of its infrastructure ambitions.
The country has invested heavily in building roads, highways and rail lines. However, it has faced increasing scrutiny over its declining quality control as well as the construction of large-scale infrastructure projects in geologically volatile areas.
Authorities said a detour route has been opened and an investigation into the collapse is under way. The Sichuan Road and Bridge Group, which built the bridge, said there is no timetable for reopening the highway.
Sign up to Herald Premium Editor’s Picks, delivered straight to your inbox every Friday. Editor-in-Chief Murray Kirkness picks the week’s best features, interviews and investigations. Sign up for Herald Premium here.