<1 > Robert Bain, Toll Road Traffic and Revenue Forecasts,
Robert Bain Publisher (2009), ISBN-10: 0956152716.

Chapter 3 surveys empirical evidence on traffic risk and lists common sources of
forecasting errors. It is written for a non-specialist audience.

<2> Toolkit for Public-Private Partnerships in Roads and Highways,
PPIAF-World Bank (Version March 2009).

Module 2 contains an Issue Paper on payment mechanisms and implications for
risk allocation.

http://www.ppiaf.org/documents/toolkits/highwaystoolkit/6/bibliography/pdf/payment mechanisms.pdf

<3> J.M Vassallo, Traffic Risk Mitigation in Highway Concession Projects: the Experience of Chile.

Journal of Transport Economics and Policy, Vol. 40 (3) (2006), pages 359-381.

Describes pioneering Chilean experience with highway concessions.

*<4> Public-Private Partnerships: Principles of Policy and Finance,

E. R. Yescombe, (2007). Elsevier Publisher, ISBN: 978-0-7506-8054-7.

Chapter 13 presents a detailed discussion of payment structures in PPP contracts.