Vietnam’s road authorities are testing self-illuminating solar-powered LED road studs on a mountainous stretch of National Highway No. 6. The pilot focuses on conditions where conventional painted lines and reflective studs can be difficult to see: heavy rain, dense fog, darkness and the reduced sightlines created by steep terrain and winding bends. By collecting solar energy during daylight hours and producing their own LED light at night, the studs are designed to create a more distinct visual path for approaching motorists. The trial demonstrates how active road delineation can support safer decision-making when drivers need early, reliable guidance through challenging sections of road.