Two announcements, both alike in identity, in fair Campbelltown, where we lay our scene.

A day after Labor leader Bill Shorten visited and promised $50 million to upgrade a notorious stretch of the Appin Road, Prime Minister Malcolm Turnbull ventured to the same seat to make exactly the same commitment.

While both parties addressed road safety, Mr Turnbull used the announcement to emphasise his push on infrastructure and housing supply, arguing the upgraded road would "unlock 35,000 new homes". He said 1800 of those homes would be available "almost immediately".