I do not understand what You mean. Are you referring to the lights (car headlights I suppose) on the bridge that keep moving continuously in a linear fashion and You want to loop the animation?
If so You can add more ellipse shaped dots - I just did one… add the new dots to the same group the first dot is placed in (“Circle Thin + Dot”).
General Idea:
Place a dot on a circle’s perimeter. Group the dot & circle together (done in Demo). Rotate this circle & dot group (Z-axis property) on the timeline. As you add the ellipse dots you will need to rotate each dot slightly - with the long axis staying tangent to the circle perimeter. Otherwise just use circular dots instead of ellipses.
Note: I will probably be gone for the rest of the night. If You have questions in the near future others may help.
The trick to a convincing simulation in a movie or any other medium involving movement involves being an excellent liar. You trick the viewer into thinking they’re seeing something they are not. Placing an oval with a gradient over a larger oval with a gradient gives the impression of a jewel. Move a blurred white dot along a curved path in front of it and create a slight shift in the gradients, and it can make it look like its reflecting light over a convex surface. As long as the viewer is not given enough time to study what you’ve done, you can get away with almost anything.
The moving traffic in the reference project is a great example of the brilliance of simplicity.
I am just think about whether it is possible to present a product with 3D transition animation, which will provide a more attractive and impressive experience.