These are definitely heavy traffic notifications.
The gray-map display shows traffic indicators better with yellow and red lines next to the road a la Google maps. I have button 7 programmed to switch between the normal map and the gray-map views.
Also, using the route information list, it will show you traffic along your route, both as as list, and on the map.
If you will be affected by traffic, there is also a red triangle on the left menu list and if you click it, it will give you traffic details and expected delay times.
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