How do I move a sprite along a path across a scrolling background?

Hi - I wonder if anyone could point me in the correct direction please ?

I am planning an 8 way scrolling background (so about 4 times the viewport size) where I will have a road circuit built using a tilemap.

I would like a car sprite to automatically follow the road around without any user input.

Any ideas on how to get started with this would be much appreciated :)