Crossword Genius

These improve vehicle safety, except in luxury car (8)

Ross

I believe the answer is:

rollbars

'these improve vehicle safety' is the definition.
(rollbar is a safety device on a car)

'except in luxury car' is the wordplay.
'except' becomes 'bar'.
'in' indicates putting letters inside.
'luxury car' becomes 'rolls' (I've seen this before).
'bar' inserted into 'rolls' is 'ROLLBARS'.

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