I think the council are pulling these signs out of the parts bin!
I went the other way today - from Dame St southbound towards Westmoreland St.
Right turn from Georges St onto Dame St: Public Service Vehicles, Motorbikes, Bicycles
@ Pens Corner where private cars turn right: Buses, Taxis, Bicycles & Access
College Green @ taxi rank: Public Transport only.
And as a reminder:
Southbound from D'Olier St to Dame St, it's: Buses, Trams & Bicycles
And RC spotted a mobile sign: Public Transport Only