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

  • Washington I-90 tolling could start in 2015
    January 2, 2013
    A planned Washington Department of Transportation (WSDOT) study could make tolling on interstate-90 bridges over Lake Washington and across Mercer Island all but inevitable. Tolling on the state route 520 floating bridge began about a year ago and transportation officials have been closely monitoring two factors: the routes that drivers are now using and the cost to replace the aging 520 bridge. In response, the state legislature last session asked for a new environmental study to review the affects of toll
  • Will interoperability prevent progress?
    January 10, 2014
    David Crawford examines the political and industrial background to the tolling technology debate. Saving the US State of California ‘millions of dollars’ in tolling infrastructure costs by encouraging new technologies is the professed aim of a legislative Bill, SB 242, which is currently moving through the State’s Senate (upper house) process. According to its sponsor, Republican State Senator Mark Wyland, permitting alternatives to the current FasTrak-branded radio-frequency identification (RFID)-based sys
  • What's Next for Aimsun?
    October 4, 2023
    Aimsun is switching strategy from being a pure software firm to one that is focused on outcomes. The company’s CEO Alexandre Torday talks to Adam Hill and explains why
  • Need to analyse risks of 5.9GHz spectrum sharing
    February 27, 2013
    Scott Belcher of ITS America explains why moves towards spectrum sharing in the 5.9GHz band should not be allowed to proceed until further analysis of the risks to road safety has been undertaken. The ability to move people and goods safely and efficiently has always had a direct impact on a country’s economic advantage and its citizens’ quality of life. It is estimated that by 2050, the number of vehicles around the world is set to double to two billion, placing enormous demands on the global transport