What was once the stuff of urban legends now spreads virally through social media claims the tunnels beneath our cities are used for child trafficking. The truth is both more mundane and important.
Investing more in cycling and walking would boost both physical and economic health, with a typical return of $5 for every $1 spent on cycling infrastructure.
As well as an infrastructure spending boost, governments are fast-tracking approvals. But these processes exist for a reason. If we get projects wrong, we live with the consequences for decades.
Smaller projects are better for delivering broad, long-term value to communities across the country, reducing inequality and cutting emissions, as well as quickly providing jobs and economic stimulus.
After the 'world's biggest work-from-home experiment', many people (and their employers) might decide they needn't commute every day. If even a fraction do that, infrastructure needs will change.
States across Australia are increasingly using market-led proposals to build infrastructure. The emerging problems reflect the inherent risks of projects that bypass proper public planning processes.
Whether you like or hate them, the way transport operates in cities needs to change.
Overseas, city-shaping mega-projects are generally overseen by local government, but in Australia state governments often step in and exclude council and community representatives from the process.
Unsolicited market proposals are not transparently assessed. Infrastructure should be built to serve the public interest, not shaped by its private backers, but the checks to ensure this are broken.
The new payphones have Wi-Fi, mobile charging and transport information. But city councils are concerned they're digital billboards for Telstra, which could cost billions in lost productivity.
The more people come to a city, the more demand for buildings is amplified.This demand creates pressure from which a range of agencies, motivations and causes arise.
Companies have an opportunity to reframe brand communications from the promotion of conspicuous consumption to becoming a regenerative force in urban economies.
State and local governments can't do much about the rapid population growth in Melbourne, but they can take steps to reduce the costs of growing disparities between the outer suburbs and inner city.
The major parties are promising tens of billions of dollars in transport spending, but only a handful of projects are on Infrastructure Australia's national priority list with approved business cases.
The major parties are promising projects costing tens of billions of dollars, with a surprisingly large overlap between them. Yet only two have been endorsed by infrastructure authorities.
If we recognised social housing as infrastructure as essential as transport links, schools and hospitals, not properly investing in it could become unthinkable.
An increase in the use of self-driving cars will change parking infrastructure in cities, and hopefully result in more colourful character neighbourhoods.
Urbanisation is the main reason for rising temperatures and water pollution, but receives little attention in discussions about the health of water streams, reefs and oceans.
In the election bidding wars, parties commit billions to transport projects, often before all the work needed to justify these has been done. More cost-effective alternatives hardly get a look-in.
Billions of taxpayer dollars are committed before all the evidence for, and against, infrastructure projects is in. As well as missing business cases, basic rules of economic modelling are broken.