The study and modelling of user behaviour using discrete choice models allows a calculation to be made for the user’s willingness to pay in exchange for quicker or improved access to final destination. Willingness to pay is a fundamental variable which is used, or should be used, in the social and economic assessment of construction projects and the running of car parks because it provides a sufficiently clear idea of the correct tariff to charge and takes into account other points of importance to the user. There are several relevant studies on this subject.