I have seen "146.52" oval stickers on automobiles on I-5 while driving between California and Washington a few years back. The auto's with the sticker have been heard replying to other stations who called them.  Is this the new way to let others know about inter-vehicle communications?  You decide. Generally it sounds like a citizen's band call out almost, "Hey chartreuse micro-bus with the one forty six dot five two oh  sticker, this is your_callsign_here, how copy" or "Hey vehicle behind