The cars were most likely not made by Roblox themselves, I recommend you take another look at their creator and credit them appropriately, although who knows, maybe Roblox is uploading meshes as of date, but I seriously doubt it. Best of luck on your endeavors.
@SubToBloxay , overall nice job! I enjoyed the showcase, though a bit more detail would be nice. Really the only thing I would change is that the road and grass cuts off abruptly - I would extend them, so the scene doesn’t look like it is floating. One final thing - the lines across the road are a bit too high, they would pop a car’s wheels. Just my thoughts,