Australian out-of-home advertising firm APN Outdoor has added two new digital billboards to its portfolio in Sydney's central business district, according to an APN Outdoor announcement.

The company announced the digitization of inbound and outbound sites on Sydney's busy Warringah Freeway at Cammeray, with the two new sites available to advertisers starting November 2.

The Warringah Freeway inbound and outbound sites will boast a 10 mm pitch for higher resultion imagery, the company said.

"Converting these two Supersites on Warringah Freeway marks an impressive milestone for APN Outdoor as we roll out our 2015 Elite Screen strategy," APN Outdoor CEO Richard Herring said in the announcement. "The high-profile nature of these sites, their broad exposure, premium location and unrivalled quality prove yet again that we are leaders in digital outdoor, and we look forward to seeing them go live later this year."