Research shows that cities benefit from car-free days in many ways.
Urban planners often hope bike-share schemes might reduce reliance on cars and help with congestion. But very few of those who use share bikes have switched from driving.
Daily routine affects how much polluted air we breathe.
Regional areas are expanding, and yet not enough attention is being paid to improving rail access to capital cities. This affects the liveability of the areas.
Cities are expanding upwards and downwards, as well as outwards. With urban density also increasing, moving people efficiently around the city, often using ageing infrastructure, is quite a challenge.
It might not be effective now, but the development of self-driving vehicles could be a game changer for public transport services.
TfL's money troubles worsen, as passenger numbers fall for the first time in two decades.
Middle-class houses in the US have grown ever larger. The average single-family home is almost twice the size of a home in the 1960s. It's time to consider the downsides of sizing up.
Trains and trams get most attention, but 'tweaking' bus transit can transform cities. Buses can be more cost-effective and deliver better service, especially for small to mid-sized cities.
Security in cities can make some people feel safe while excluding others. New ways of planning and policing public space are needed to ensure cities are safe and accessible for all.
In the 1970s, both Kyoto and Melbourne made fateful decisions about their transport networks. Melbourne today enjoys the benefits of trams, while Kyoto lives with the consequences of losing them.
Transport infrastructure has such an impact on what kind of city we become that more democratic planning is long overdue. But public consultation is typically limited and focused on design issues.
Free public transport could be one way to get more people to ditch the car.
A comparison of Australian cities reveals cyclists and walkers are still very much a minority of commuters, despite the economic, health and environmental costs. Action on three fronts is needed.
The real challenge is finding appropriate ways to invest in public transport that will not only take pressure off the system but also support improved travel on all modes, including cars.
Australian cities generally don't allow pet dogs on public transport. Instead, owners need their own vehicle to travel with their dogs, and it's a surprisingly important factor in our car dependency.
The government claims figures showing the south gets more than the north are misleading.
A survey revealed that 15% of Londoners had experienced some form of unwanted sexual attention on public transport.
Cities around the world are starting to rethink the vast areas of land set aside for parking. The convergence of several trends likely will mean this space becomes available for other uses.
A new campaign targeting sexual assault on public transport is a positive development in some respects, but is unlikely to generate substantive, longer-term change.