Lam Dong authorities have ordered emergency measures and called for a natural disaster emergency declaration following a landslide on Prenn Pass, a key route linking Dalat with southern Vietnam.
The uphill embankment on Prenn Pass suffers a landslide (Photo: Minh Hau).
During an on-site inspection on September 21, Lam Dong People's Committee chairman Ho Van Muoi instructed relevant agencies to install warning signs at both ends of the route and implement measures to ensure public safety.
Provincial authorities also directed emergency teams to focus on stabilising the landslide area and maintain personnel at the site to respond quickly to any further incidents.
Authorities are carrying out works to reduce the load on the uphill embankment along Prenn Pass to prevent further landslides (Photo: Minh Hau).
Prenn Pass, which stretches approximately 10km along National Highway 20, is the main road connection between Dalat and Ho Chi Minh City.
The latest incident occurred on the afternoon of September 19 when heavy rainfall triggered the collapse of three large boulders from a steep hillside several dozen metres above the roadway.
The rocks crashed onto the road surface, disrupting traffic on the pass.
Several motorists travelling through the area spotted the falling rocks in time and stopped their vehicles to avoid danger, preventing any casualties or property damage.
According to the Lam Dong Department of Construction, the site has experienced eight landslides since June 2026, highlighting a significant and continuing risk to road users.
Surveys conducted after the latest incident found that the affected slope is between 20 and 25 metres high and extends for around 120 metres.
Officials said the geology of the area consists of soil mixed with isolated rock formations. The slope has become structurally unstable, making it highly susceptible to further landslides during periods of heavy rain.
Authorities are now considering the formal declaration of a natural disaster emergency for the site as repair and stabilisation work continues on one of the region's most important transport corridors.