Actually that "junk" data is simply wrong placed UV map data. This ain`t be brutal, but... for example, I can show how the Parking Cop front side looked like before:
.. and now, with my UV and normals edit:
Unfortunately, it wastes way too much time, so I`ll try to post here each completed and edited car, I`m done, before packing them altogether.
EDIT:
As messing around in MC`s csv files, I found that there could be found few MM2 leftover data files, same as many useful .csv`s.
I converted some sounds and created a sirens mod, which replaces London`s ones and adds New York`s on SF`s place.
Download
For some reason, I need to tweak the sounds a bit, but I think they`re good now