2005 E320 W211 with Comand system. From time to time, on the map/nav display, there's a seemingly endless line of little car symbols shown on one side or other of the road I'm travelling. Looks rather like a zip fastener. Does anyone have any idea what this means ? There are other symbols that are occasionally shown, some of which I don't recognise. Is there anywhere that shows me what all the various Comand map symbols are and what they mean ?