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

  • ITS (UK): Shift to emissions free vehicles will make road network funding unsustainable
    November 30, 2017
    Shortfalls in fuel tax caused by moving to emissions-free vehicles will make current ways of funding road networks unsustainable, according to a joint forum between ITS (UK) Road User Charging Interest Group and ITS Ireland hosted by Aecom, Dublin. The group consisted of policy makers, toll operators, payment providers and highway users from seven European countries.
  • The sunshine subsidy for Colorado’s tollways
    January 10, 2014
    David Crawford reports on energy cost cutting on US highways. Just over a year after switch-on and with two global awards under its belt, the longest solar-powered toll road in the US is generating heightened interest in highway applications of alternative energy. The E-407, which loops around the eastern perimeter of the Denver metropolitan area in Colorado, won the International Bridge, Tunnel and Turnpike Association (IBTTA) President’s Overall Award for Excellence at its September 2013 Annual Meeting in
  • Texans would support toll interoperability
    September 12, 2014
    As transportation industry experts from around the world gather in Austin, Texas for the International Bridge, Tunnel and Turnpike Association’s 82nd Annual Meeting and Exhibition, 14-17 September, infrastructure solutions firm HNTB Corporation announces the results of a new America THINKS tolling survey, including the public’s views on tolling in the State. According to the survey, close to three in four (73 per cent) Texans who regularly drive on roads or bridges with tolls are pleased with the value
  • Benefits of traffic data sharing with app developers
    November 10, 2015
    Timothy Compston finds out if exchanging traffic and road condition data with private app developers makes sense for both drivers and road authorities. Much has been said about the potential benefits for authorities in sharing data with traffic and navigation app developers, and receiving ‘crowdsourced’ information in return – so how is it working in practice?