How to measure a vehicle with a high accuracy with mm?

[MarkT]

@absoltue_beginner

okay, first of all: I did not tell you the truth: actually, it is not going to be a vehicle "on wheels". It is going to move on tracks, like these ones:

Well if you'd explained that.... Simple, linear encoder strip/scale (optical or magnetic are available).

Good search terms: "motion control", "DRO", "linear scales"