On New Year's Eve in Sydney, there will be multiple road closures and buses will be diverting around the celebrations.  In North Shore and West region:

• Buses will be diverting while roads are closed in the Sydney CBD from 4am and in North Sydney from 2pm.
• 254 & 291 terminate at North Sydney starting from 7pm, 30 December.
• Wynyard services will be departing from North Sydney between 11pm to 1:30am.
• Park Street and Druitt Street services will be departing from QVB between 5pm to 4am.

For further information see Transport for NSW website