Crossword Genius

Driver's concentration required on trip? It'll aim for change (5,5)

Ross

I believe the answer is:

legal limit

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

'driver's concentration required' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'trip? it'll aim for change' is the wordplay.
'trip?' indicates an anagram (I've seen 'trip' mean this).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'change' becomes 'leg' (leg is a kind of change).
'itll'+'aim'='itllaim'
'itllaim' anagrammed gives 'allimit'.
'allimit' put after 'leg' is 'LEGAL LIMIT'.

'on' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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