Structures that cross a waterway, such as railway bridges, road bridges and pipelines, must carry navigation-span signals that follow Vietnam's inland waterway signalling rules (22TCN 269-2000) to guide vessels on the route.
Solar lanterns only work reliably when they get enough sunlight to charge their batteries. They therefore
must be mounted at least 1 m away from the bridge structure
so that neither the bridge nor the sign boards shade them.
Below are some ways of installing solar navigation-span signals, for contractors' reference.
Installation guide for bridge span navigation signals
VIJALight® navigation-span signals are installed on bridges including:
– Khanh Hoi, Cha Va, Chu Y, Calmette and Phu My bridges, Ho Chi Minh City
– Go Gang bridge, Vung Tau
– Phu Luong bridge, Hai Duong
– Doan Vi bridge, Ninh Binh
– Hong Phu bridge, Phu Ly
– Hoa Binh bridge, Bac Lieu province
– Thom bridge, Ben Tre province
Incorrect installation: the lanterns sit right against the bridge, the sign board shades the upper lantern and the upper lantern shades the lower one. Neither gets enough sunlight, so they don't work properly.
Correct installation: the lanterns sit more than 1 m from the bridge, unshaded, and get enough sunlight to work very effectively.
Download: installation guide for bridge span navigation signals