I am not in my vehicle just now but recall it is not easy to find.
Have you tried the yellow triangle at the left of the map screen and then 'settings for map view' / 'traffic info map'?
there is a write-up on this in the owners manual as well as some guidance in the iDrive / vehicle info selection
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2013 650i Gran Coupe xdrive
Prior: 2010 550i GT xdrive | 2008 335i Convertible | 2007 335i Coupe | 2006 130i Hatch | 1998 540i Sedan
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