1. Arup, ITS Leeds and Accent: Provision of market research for value of time savings and reliability Phase 2 report to the Department for Transport (2015)
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/470231/vtts-phase-2-report-issue-august-2015.pdf
. Accessed 13 Dec 2018
2. Daly, A., Tsang, F., Rohr, C.: The value of small time savings for non-business travel. In: Transport Economics and Policy, vol. 48, 2 May (2014)
3. De Borger, B., Fosgerau, M.: The trade-off between money and travel time: a test of the theory of reference-dependent preferences. J. Urban Econ. 64, 101–115 (2008)
4. Department for Transport: WebTAG Unit M2, section 5 (2017)
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/603266/webtag-tag-unit-m2-variable-demand-modelling-march-2017.pdf
. Accessed 13 Dec 2018
5. Fosgerau, M., Hjorth, K., Lyk-Jensen, S.: The Danish value of time study: final report (2007)