The Cost‑Benefit Analysis Manual: Road Projects 2011 (Queensland) provides a structured framework for evaluating the economic viability of road infrastructure investments. The manual outlines procedures for identifying project costs and benefits, estimating traffic demand, and assessing impacts such as travel time savings, vehicle operating costs, accident reduction, and environmental effects. It explains how to quantify and monetize these impacts to compare project alternatives and determine whether a road investment generates net benefits for society. The methodology emphasizes consistent assumptions, transparent modelling, and sensitivity testing to address uncertainty in forecasts. It also recommends using indicators such as Net Present Value (NPV), Benefit-Cost Ratio (BCR), and Internal Rate of Return (IRR) to support decision-making. Overall, the manual guides planners and analysts in conducting systematic economic appraisals to ensure road projects deliver efficient use of public resources and maximize long-term social and economic benefits.
