Commuters are paying the price for a protected industrial dispute between bus drivers and the operator of some Adelaide Hills services, South Australian Premier Peter Malinauskas says.
The drivers, who work for Keolis Downer subsidiary Southlink, walked off the job for 24 hours on Tuesday after a breakdown in negotiations over a new pay deal and rostering pressures.
The strike impacted bus routes across the Hills, including services running from Aldgate and Mount Barker to Adelaide, as well as some local school runs.
Mr Malinauskas said Deputy Premier Susan Close took part in Monday's talks and it was disappointing the parties could not reach an agreement.
"The people who are paying the price are Adelaide Hills commuters that rely on public transport," he said.
Transport Workers Union branch secretary Ian Smith said the strike action was a last resort and not taken lightly.
"But after over six months of protracted bargaining these drivers have been left no choice," he said.
"They deserve a fair deal that recognises the essential work they do, and doesn't lock in substandard wages and conditions for years to come."
Ahead of the strike, Adelaide Metro urged Hills commuters to seek out alternative transport options.
"SouthLink and Adelaide Metro thank all customers for their patience, and apologise for any inconvenience caused by the industrial action," it said.
Mr Malinauskas said the government remained ready to do whatever it could to help the union and the company reach an agreement.
"I really hope that they do come together and make that happen," he said.