Dongho Bridgie.
The 동호대교 (Dongho Bridge) consists of three independent sections; the two blue spans on the outside are for cars, while the orange span in the middle was built for subway line three. At night, the bridge isn't constantly illuminated, instead the lights change as subway trains pass over. When a train reaches the bridge, a succession of lights appear, following each train in a wave like motion; then turning off in the same pattern behind the last car.
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