Planning Sustainable Transport

Chapter 20

The need for a new methodology to estimate travel demand

There has been a constant theme throughout the preceding chapters that the transport system should be treated as an entity, including all modes and the interfaces between them. The logic behind this stance is that the great majority of movements consist of a number of linked segments, often by differing modes, stretching from the journey start to its end and including the interfaces between segments. This system unity implies that investment should be from a single transport budget rather than individual modal budgets, and this, in turn, implies that there has to be a single assessment methodology. Chapter 19 described the development of the current methodology, but it is inherently ...