Commuter chaos and extended delays are expected on Friday morning as hundreds of bus drivers across Victoria plan to go on strike.
More than 1500 employees from leading bus operators Dysons and Ventura are planning to walk off the job for 24 hours after a breakdown in negotiations with The Transport Workers Union (TWU).
TWU Victoria Branch Secretary Mike McNess said the planned strike is a last resort for frustrated workers who want better employment conditions.
"We apologise for any inconvenience to the public this Friday," Mr McNess said.
"It is a last resort for bus drivers and an incredibly difficult and disappointing decision for bus drivers to make. I urge the Victorian public to stand behind essential public service workers in their pursuit of fair conditions for the future."
Concerns range from inadequate meal breaks to overtime and fair wage increases.
Both Dysons and Ventura employ more than 3000 staff collectively, with more than 1300 buses in their fleet.
"For Dysons to blatantly refuse to pass on state government wage subsidies to the bus drivers who provide essential public bus driving services is nothing short of a disgrace and a slap in the face to their workforce," Mr McNess said.
"Ventura's refusal of improved work-life balance, fair overtime rates and satisfactory meal break arrangements shows little respect for essential bus drivers."
Both Dyson and Ventura declined to comment.