The South Australian opposition has urged the state government to reveal what plans it will put in place if a bus strike disrupts the royal visit to Adelaide.
Some bus drivers have voted to strike for 24 hours on either Tuesday or Wednesday next week.
If they walk off the job on Wednesday it threatens to disrupt the travel plans of people heading to see the Duke and Duchess of Cambridge who will visit the northern suburb of Elizabeth on the day.
Opposition transport spokeswoman Vickie Chapman said the strike would also coincide with the shutdown of some rail services for upgrade work.
She said it could potentially create problems for tens of thousands of people wishing to catch a glimpse of the royals.
“There will be commuter chaos next week, but it is clear that the Labor government has done nothing to prepare for the transport network chaos ahead,” Ms Chapman said.
The Transport Workers Union said people heading to see the royals could get caught out if the strike was held on Wednesday.
The union remains in dispute with SouthLink, the company that operates bus services in Adelaide’s northern and southern suburbs, over a pay and conditions claim.
SouthLink drivers have been offered a three per cent annual pay rise along with action to address safety concerns.
But they remain at odds with the company on rostering issues.
Industrial Relations Minister John Rau has urged both parties to return to negotiations and has offered to mediate.
A meeting between the minister, SouthLink and the union is expected later this week.
Transport Minister Stephen Mullighan said contingency plans were also being prepared to minimise the impact of any strike on commuters.
The government said SouthLink aimed to cover services where possible with non-union drivers.