ABSTRACT
The motivating minimand driving the calculations remained the material cost of movement throughout the projections. No changing balance of preferences intervened to sway behaviour. The analysis, design and evaluation of transport investments and policies is permeated with strong assumptions and credulous over-confidence. A variety of models and approaches to transport investment decision-making have been promulgated and used over the last quarter century and a fund of practical experience has been built up in some cases. Careful analysis, estimation, and monitoring can effectively guide the planning process with the aid of a model which describes the behaviour of the system during the control-determination phase. Robustness, as a concept and in a particular operational form, has been proffered in this book as meaningfully meeting the requirements of efficient transport planning. This confession of failings and litany of cautions provides a firm foundation for elaborating investment strategetics based on robustness.
