road building idea

if roads get added here is an idea for how to build them
there will be a new vehicle and a new building and a tool
vehicle will be some kind of road placing machine that will automatically scrape up one layer of soil and replace it with whatever the roadbuilding material is
the building will have a spot for the roadbuilder vehicle to load and unload materials as well as inputs for road material and outputs for what the vehicle replaced.
how the vehicle knows what to replace is by a tool similar to the dig/level/dump tool but all it does is select tiles to be replaced, maybe it has a mode for the 4x4 tiles and one for the tiny individual tiles