If I remember correctly there was talk of a major change to the shield generator that would necessitate redoing all of the shields. Is that still going forward? That was the main reason I stopped adding them.
As far as the turnpike shields, English Wikipedia (not Wikimedia Commons) is using them under fair use. (Wikimedia Commons, the central repository for Wikimedia projects, does not allow fair use). I don't know if what is being done here would qualify under fair use.