BUS services are being disrupted again today as drivers walk off the job as part of ongoing industrial action.

Several hundred SouthLink drivers are strking for four hours, mainly affecting routes in Elizabeth, Pooraka, Lonsdale and parts of the Adelaide Hills.

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Some buses stopped as early as 8.45am, ahead of the official 10am to 2pm industrial action.

Transport Workers Union state secretary Ray Wyatt said the 10am to 2pm time frame had been chosen to cause as little disruption as possible by avoiding the school run and rush hour.

However, he said drivers’ frustration at the prolonged negotiations for improved pay and conditions could result in tougher action against the bus company.

“We are trying to manage the action to not disrupt people’s lives too much but we may have to take 24-hour stoppages to get our message across,’’ Mr Wyatt said.

Today’s stoppage is the second strike targeting SouthLink since February.