The Minister for Health has said it was a Government decision to allow the return of public transport to full capacity and was not based on a National Public Health Emergency Team recommendation.
Public transport is operating at 100% capacity across the country, as the Government implements a phased plan to lift most Covid-19 restrictions by 22 October.
Face masks remain a mandatory requirement on all public transport.
Stephen Donnelly said Minister for Transport Eamon Ryan was keen to see a full return of services, as the restrictions in place were putting pressure on transport networks.
Speaking on RTÉ's Morning Ireland, Mr Donnelly said he fully supports the decision.