Was going crazy trying to figure out why this function didn't work between me and my friends that were logged in and traveling, until I ran across a note somewhere in the documentation which said something like "Note: this function will not work while the recipient of the message or beep is traveling (in motion) so as not to distract the driver. My question is: How is this (message not displaying) any different from the pop-up messages (warnings of police, traffic, accidents, etc.)that other drivers or Waze sends and displays. Are you saying those will not distract the driver? Can't imaging that's what you mean! So why restrict the function?