On the night of 11 June 2023 a bus overturned at Greta in Australia's Hunter Valley region.

It was the worst Australian road crash since 1994 when twelve people were killed when a bus overturned near Boondall, Queensland.

[1][2] At 11:30 p.m. AEST on 11 June 2023, a 2009 Volvo B7R bus operated by Linq Buslines overturned while negotiating a grade separated roundabout at the M15 / Wine Country Drive interchange near Greta.

A mandatory drug test determined that he had taken 400 mg of tramadol during the previous 24 hours, enough to impair his driving ability.

It was also presented in court that Button was addicted to painkillers, and these may have affected his driving performance on the day of the crash.