ABSTRACT
The sequence on which the arrangement of this book is based is explained in the
continuous loop in Figure 1.1. This chapter discusses how the need for a road is assessed.
This must be done in the context of the planning of the larger transport system, of which
the road-based route is just one part. Transport planning is examined in Chapter 31 which
covers (Sections 31.1–3) the full range of transport facilities — systems and networks,
corridors and sectors, and individual routes. Section 31.4 shows that one of the key
outputs of transport planning is the production of specific proposals for the expenditure of
funds to bring about changes to a transport system, raising its existing condition to some
improved level of service. Such studies can have time horizons of ten years or more. The
resulting proposed facilities must satisfy overall and specific community and industry
needs and constraints.
