"The union have been spoken with on a number of occasions, asking that protests are carried out in a safe manner, but it would appear these requests are being ignored.
"We are very disappointed that passengers in Hamilton who rely on our buses to get to work and school, including NCEA exams, are being so seriously impacted.
"We apologise to our passengers, who will experience significant delays across our services again today," he said.
The action by drivers comes two days after similar action on Monday morning.
It is a result of failed pay negotiations with both parties sitting at a stalemate. Union drivers want to be paid the Living Wage which is currently set at $20.55 an hour, more than $4.05 than the minimum wage set by the Government.
The company has instead offered a 1.5 per cent rise.
The now bitter pay dispute has been ongoing for more than 18 months.
Anyone wanting updates on bus movements is asked to check the BUSIT Facebook page: www.facebook.com/BUSITWaikato or the BUSIT website, www.busit.co.nz, or by calling the 24-hour bus infoline on 0800 205 305.