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You might want to check out the Sikorka presentation by u/lefterisjp at DevCon2 about contract location awareness. https://youtu.be/90ZMaX7PT3U
Also, anecdotally, while passing through Washington DC one day to see the Smithsonian Institute, I was forced to download an app to pay my street parking nearby. https://play.google.com/store/apps/details?id=com.seeclickfix.dc311.app
The app does things in addition to parking, but here you can also get more ideas. Municipal clients for location aware contracts and dapps really could be huge!