The restriction applies to the mountain pass connecting Khanh Hoa and Lam Dong provinces, with police in Nam Khanh Vinh Commune deploying officers to enforce the overnight closure and warn motorists.
Vehicles are permitted to travel through the pass only between 5am and 6pm, with motorists urged to remain vigilant as heavy rain and flooding continue.
Provincial authorities have also advised residents to avoid roads identified as high-risk landslide areas and use alternative routes where possible.
To assist motorists facing accidents, vehicle breakdowns or weather-related emergencies, Khanh Hoa police have installed three emergency communication posts along Khanh Le Pass.
The SOS system allows road users to transmit images and incident details to a digital map at the monitoring centre, enabling authorities to respond promptly.
According to the provincial meteorological agency, heavy rain and thunderstorms affected Khanh Hoa from the evening of November 11 to the morning of November 12.
Rainfall generally ranged from 30 to 70 millimetres, with some areas recording more than 120 millimetres, raising the risk of landslides along major roads and mountain passes.
In response, the Khanh Hoa People's Committee instructed departments and local authorities to activate commune-level disaster response plans, assign personnel to vulnerable areas and install warning signs.
Officials were also told to prevent people and vehicles from crossing flooded roads, streams, low-lying areas and locations at high risk of landslides.