speed flag

I'm using my GPSMAP 66i for navigation on my motorcycle

The Orientation is "Automotive Mode"

The Dashboard is "Automotive"

The Guidance Text is "When Navigating"

Across the top I have directions "Continue to 134th St Seast"

In the lower left is "Arrival Time"

In the lower right is "Speed".

Occasionally the speed will show in RED if I am over the speed limit. It does not show every time I exceed the speed limit, so I don't know why it shows when. Any information would be appreciated.