Stagecoach bus workers in South Yorkshire plan strikes
Four days of strike action are planned by bus staff in South Yorkshire if a pay dispute is not resolved by Friday.
Members of union Unite who work for Stagecoach South Yorkshire would walk out on Friday, next Monday and on 2 and 3 December.
Barnsley, Rotherham and the Dearne Valley would be affected by the strike.
Stagecoach said it would run a "near-normal" service between 07:00 GMT and 18:00 GMT on strike days and all school services would operate as normal.
John Evans, of Unite, told BBC Sheffield that the strike would be a last resort.
"Our members are looking for parity with their colleagues in other companies because they are in a sense the poor relations within South Yorkshire," said Mr Evans.
"There has been another offer put on the table and we're looking at that at the moment."
He said Unite had been in discussion with the company since April, but they had not been able to resolve the issue.
Stagecoach said more than 100 relief drivers would be drafted in from other areas to minimise disruption to passengers.
Services in Sheffield and Chesterfield, including route 265 to Barnsley, and those operated by Stagecoach East Midlands in south Rotherham and Doncaster would run as normal, the company said.