Make your own, print it out and laminate it. Put it in the glovebox where it is easy to find. If you break down, leave it lying on the dash near the VIN plate.I like this sticker but where would you put it? I wouldn't want to put it anywhere visible because it is ugly lol.
This won't work unless every driver is educated about the issue, and you trust them to remember about the placard.....
John Davies
Spokane WA USA