Hundreds of Yorkshire bus drivers on strike
Hundreds of bus drivers are on a 24-hour strike over pay and shifts.
About 850 Arriva drivers at depots in Castleford, Dewsbury, Heckmondwike and Wakefield in West Yorkshire, and Selby in North Yorkshire, were due to strike.
The walk-out started at 03:00 GMT and bus passengers were urged to plan for a longer journey.
Arriva apologised and said it was disappointed that the Unite union had not accepted its latest offer to try to resolve the dispute.
"We are disappointed that the union negotiating committee refused to ballot members on this increased offer in favour of a 24-hour stoppage", Arriva said.
Unite officer Phil Bown said: "Strike action is not being taken by our members on the back of a whim."
After 12 months of talks union members were angry about not being offered "anywhere near a reasonable increase", he said.