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Black lines in Navigation preview

Can anybody throw any light on the black lines that appear when previewing a route in Navigation? Originally I thought they represented the route from my current location to the first waypoint but it’s difficult to tell what they are and what relevance they have except to totally confuse things. See the attached screenshot of part of a route which takes a simple slip road from a main road into a motorway. I have no idea what all the black segments mean.
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