South Australia is banking on infrastructure as a means to boost its economy and employment, as the state pumps billions into public asset investment in 2017.

The government says it is spending a record $12.1 billion on public infrastructure projects this year, including $1.5 billion in commencement of new works. Major new projects to commence this year include the Torrens Rail Junction and Mike Turtur Bikeway overpass ($238 million), the $220 million redevelopment of Festival Plaza,…