Why does Nikon D80 always delay shooting night scenes, which makes it very virtual?

I also bought a new D80 and got to know it. I heard that it takes a long time to turn off the flash at night, so there is a delay as you said. The D80 also has a B-gate function, which will delay for a longer time. The photos taken in this way are what we usually see, for example, the light of the headlights is elongated and the whole road surface is elongated. Very empty is the result of your shaky hands because of the long exposure time. So you need a tripod.