JavaScript modification - 2D visualization of a speedway race.

I have a script written in JavaScript that creates a visualization of a speedway run based on the input (time). It is a simple script that, based on a mathematical formula, moves the helmets (riders) along the appropriate lines so that it looks like a speedway run. I would like to modify it so that these helmets are turned into two graphics. One will be on the straights and the other will be on the curves so that the motorcycle can be seen from above. In addition, I would like to get some configurations of the riders' rides according to the lines we draw (about 10 different cases). At this point, the script will continuously calculate the lines along which the "helmets" move. The exact explanations already detailed (I realize that the description may be hard to understand) can be determined by phone.

In the attachment I have added how it looks like. I think it will make it a lot easier to understand what I mean.