Jo Haylen on notice over any more revelations after asking chauffeur to drive 446km for winery lunch

Chris Minns says if more trips by transport minister came to light it would weigh very heavily on me' as premier announces we are changing the rules'

The embattled New South Wales transport minister could be in hot water if further revelations emerge about her use of a ministerial car for private purposes, the premier has suggested.

It emerged on the weekend that Jo Haylen had asked her chauffeur to take her and some friends to a winery lunch on the Australia Day weekend. It involved a 13-hour 446km round trip for the driver, from Sydney to Haylen's holiday house at Caves Beach and then a Hunter Valley winery and back.