[ocengb]

Haha, I've just talked with the author. :) There is a market for crowded cities, I think. When you park your vehicle in front of a crowded place etc you can print/write a link to reach you if needed. There are some anonymity number services, but for internet users, this can be a solution to keep their numbers private. Good luck!

[xp84]

Apparently in parts of Asia (I can't recall which between CJK) it's customary to have a cute little widget mounted inside your driver-side window that you put your phone number on, and it can be opened and closed as needed, and people know to check for that anytime they need to contact you to move your car. Seems quite civilized. Although I wonder if that means that people double park all the time...

[toppy]

Such a link could be created automatically when you register for a car plate.