I worked on at least two projects that required Building permits. i recall purchasing at least two of these for future projects.. I know that I donated at least one of them. Of course, it is possible that they were another kind of permit but i recall them being some kind of Building permits.
There really were no why's in street projects, they have needed then since i started along with tons of other materials, its just the way it is.
And when they have a projects back and maybe group halls and the like, will need them once more :)