Skip to main content

Monetising time savings makes toll roads financially stack up, says research

Putting a financial value on the savings from traffic congestion, noise and air pollution as a result of toll roads and tunnels will make large infrastructure projects more cost effective, according to a new study by Australia’s Queensland University of Technology (QUT). Sae Chi, from the university’s Science and Engineering Faculty, has compared the financial and economic cost of public and privately operated toll roads and tunnels, and found the net impacts to the community should be taken into account
September 29, 2017 Read time: 2 mins
Putting a financial value on the savings from traffic congestion, noise and air pollution as a result of toll roads and tunnels will make large infrastructure projects more cost effective, according to a new study by Australia’s Queensland University of Technology (QUT).


Sae Chi, from the university’s Science and Engineering Faculty, has compared the financial and economic cost of public and privately operated toll roads and tunnels, and found the net impacts to the community should be taken into account in decision-making about transport infrastructure investment.

The research has been published in the Journal of Transportation Engineering titled Measuring impacts and risks to the public of a privately operated toll road project by considering perspectives in cost-benefit analysis.

The report claims that the financial bottom line should not be the only consideration when determining whether or not to invest in toll roads and tunnels.

Governments often partner with the private sector to share the costs and risks of building and operating toll road and tunnel projects. However, the report says that while private operators were looking for a bottom line return on investment, governments needed to consider benefits in addition to toll charges and traffic flows that can result in profits. Even when partnering with the private sector, it is important that governments consider the public benefits and monetise savings such as travel time, reduced costs to drivers and the positive outcomes for the environment. Chi believes that when governments put a financial cost on these factors the cost-benefit analysis sways much more heavily in favour of supporting infrastructure investment.

Chi said current cost-benefit analysis for road and tunnel projects was limited in Australia, and in most cases focused on the financials and not the public benefits. “But governments are responsible for public decision making for the good of their constituents and this includes ensuring that public funds are invested wisely and that regulation of private sector activity ensures a net benefit to society,” she said.

Chi believes the study findings would help support increased infrastructure investment across the nation, especially in high-growth population areas.

Related Content

  • New research assesses potential for driver-assistive truck platooning
    May 29, 2015
    The Phase One Final Report of the Driver-Assistive Truck Platooning (DATP) initiative was recently released by the research team. The DATP truck platooning research, which was funded by a grant from the US Department of Transportation's Exploratory Advanced Research program, utilises radar, vehicle-to-vehicle communications and video technologies to decrease over-the-road truck headways, with the objective of improving fuel economy without compromising safety.
  • ITS America focuses on the environment
    March 13, 2012
    ITS America's appointment of a Director of Environmental Affairs signals a major new focus
  • NGMN calls on EC to rethink connected car technology
    December 12, 2018
    An organisation representing telecoms network operators has warned European lawmakers that their vision for the development of cooperative ITS (C-ITS) risks being too narrow. In a letter to European Commission president Jean-Claude Juncker, the board of the NGMN Alliance highlights a key piece of EC legislation which will determine the technologies used for connected vehicles – and urges the inclusion of cellular-V2X (C-V2X) on the list. “Despite the EC’s stated commitment to technology neutrality, we
  • Congestion charging in New York edges a wheel-length closer
    May 16, 2023
    'This is about more than reducing traffic' says city mayor, pledging transit investment