After several phone calls late Wednesday trying to see if there was any truth to a rumour, it was confirmed via a media alert from Andrew Constance's office.

The ceremony will take place on the grassy section near the northern roundabout - adjacent to Kirkland Crescent - from 11.45am.

The alert also set out the agenda for Thursday's ceremony, including speeches from Roads and Maritime Services representatives, Mr Constance, Member for Eden-Monaro Peter Hendy and Bega Valley Shire Mayor Bill Taylor.

A plaque is also set to be unveiled.

It is unclear why the public was not alerted to such a long-expected event with more notice, but a contact within RMS confirmed it is going ahead.

The bypass has been open to traffic since mid-October (click here for related story)

More as it comes to hand.