A car move along curves follow path +RESOLUTION

I want a car in blender to move along curves, and use curves to represent the trajectory of the car. The speed of the car is non-uniform. I have used the bevel_factor_mapping_start of curves to perfectly express the speed of the car. If I use “spline”, The trolley can perfectly match the curve, but because I want to accurately represent the trajectory of the trolley, bevel_factor_mapping_start must use RESOLUTION. Here, the trolley cannot match the curves. How to solve the problem that the trolley matches the curve bevel?

https://dev-files.blender.org/file/download/fmjypg4tgebotma7six3/PHID-FILE-ghojcfxag2d3moy6fnsu/carok.blend