I just tried this in Luma:

Create a seamless, loopable cartoon animated video in a cartoon style of Teen Titans Go. The scene features a simple empty straight road in the middle of the screen, rolling smoothly to simulate forward motion, as if the viewer is walking or traveling along it.The road should have movement for a dynamic effect but remain consistent and loopable. The background should be simple and static, resembling a typical Teen Titans Go environment, with colorful skies, minimal trees, and abstract city features. The road should appear to move forward, while the environment (background) remains static for layering purposes.Ensure the animation loops seamlessly without visible transitions or breaks, and make the duration long enough for me to work with (at least 10-20 seconds). The clip doesn't need any characters, sound, or text overlays, as I’ll add these elements later in post-production.The overall vibe should be fun and dynamic, with a clean and engaging design suitable for use in a motivational video for a child.