The National Bus and Rail Union says the lack of bus lanes and enforcement as well as traffic congestion in Cork need to be urgently tackled.

He was speaking as Dublin Bus said it will deploy security guards across services amid a sharp increase in incidents of anti-social behaviour.

The North's Infrastructure Minister dealt with a number of questions in the Assembly from MLAs who complained about ‘traffic chaos’ in Belfast.

Online posts by such groups, which urge pressure to be applied to both individual workers and companies, have risen sharply in recent weeks, but one travel company has been the victim of such posts for more than a year.

The first walkout in the dispute over pay will take place on Thursday February 1.