Experts from the Cosmopolis Centre in Brussels agree that the effects of free public transport on car traffic levels are marginal, arguing that by itself free public transport cannot significantly reduce car use and traffic, or improve air quality.
So what can? Well, the researchers found that the behaviour of motorists and the transport mode they choose depends very little on public transport fares. Rather than relying on free public transport to engineer the shift, a more effective way to reduce the number of people choosing to drive could be regulating car use.
Increasing the cost of parking, congestion charging, or increasing fuel taxes could all be combined with free fares to lower car demand.
How successful fare abolition is at tempting people to use buses and trams depends on the quality of the service. Cleaner and more reliable public transport must be a prerequisite for these schemes if buses and trams are to compete with the car, and making it part of a wider investment plan could have a big impact on the sustainability of transport.
Fare abolition can help to make public transport visible as a valid alternative to the car in cities where many residents might have forgotten about it over time, due to chronic underinvestment.
Free public transport may not be effective for making transport sustainable on its own, but it can have plenty of other benefits that make it worthwhile. It can be a progressive social policy, guaranteeing and improving access to public transport for diverse groups that might otherwise struggle to get around.
Enrica Papa is a Senior Lecturer in Transport Planning, University of Westminster
THIS ARTICLE WAS ORIGINALLY PUBLISHED ON THE CONVERSATION