Stagecoach drivers will begin industrial action on May 26.
Bus drivers are to take strike action over six weeks in a pay dispute.
Unite the union said around 430 Stagecoach drivers will take action after last minute pay talks did not lead to an improvement in an “unacceptable” 4% pay offer previously rejected by members.
The union said that “widespread and prolonged” industrial action will hit bus services in the west of Scotland.
The action will affect buses operating out of several depots in Ayr, Arran, Ardrossan and Kilmarnock servicing bus routes in Ayrshire, Lanarkshire and Glasgow, Unite said.
Strike action will take place on May 26 and June 2 and 6 and will be followed by six weeks of continuous action starting on June 9 and lasting until July 21.
Siobhan McCready, Unite industrial officer, said: “Stagecoach West Scotland have not improved their pay offer in six months.
“The drivers are being asked to fund a pay rise by working longer hours, taking longer unpaid breaks and losing a week of annual leave.
“This is simply unacceptable, and it will not be tolerated by Unite.
“Widespread and prolonged industrial action is set to hit bus services across the west of Scotland because this company doesn’t seem capable of listening to its workers.
“It’s not right that the drivers are the lowest paid across the whole of the Stagecoach group. Our members deserve a fair rate and that’s what we are determined to get for them.”
Unite said members voted by 98% to take industrial action after rejecting the 4% pay offer which was tabled last November.
The union said the current pay offer is “unacceptable” and claimed it would leave the drivers among the poorest paid across Stagecoach’s UK operations.
Unite general secretary Sharon Graham said: “The company can end this dispute at any moment by putting forward a fair offer.”
Stagecoach has been asked for comment.
