Crossword Genius

Motorway approaches affected by black ice? (4,5)

Ross

I believe the answer is:

slip roads

I'm a little stuck... Click here to teach me more about this clue!

'motorway approaches' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

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