Select models to be used in analysis
Overview
Section titled “Overview”Select the models to be used in the Analysis.
Road Deterioration and Works Effects
Section titled “Road Deterioration and Works Effects”The Road Deterioration and Works Effects (RDWE) models predict how road condition changes over time and how maintenance and improvement works affect that condition.
The Road Deterioration (RD) models predict changes in pavement condition, such as cracking, rutting, ravelling and roughness. The predictions take account of factors such as traffic, pavement strength, climate and drainage.
The Works Effects (WE) models predict how maintenance and improvement works, such as patching, overlays and reconstruction, change pavement condition and affect subsequent deterioration.
Together, the RD and WE models estimate the condition of the road, the work required to maintain or improve it, and the associated costs. This information is used to assess and compare alternative road investment strategies.
Vehicle Operating Costs
Section titled “Vehicle Operating Costs”The Vehicle Operating Cost (VOC) model estimates the costs of operating vehicles on a road network.
It estimates the consumption and cost of resources such as fuel, oil, tyres, spare parts and maintenance, as well as other vehicle costs such as depreciation, driver and crew costs, and overheads. These costs depend on factors such as vehicle type, road geometry, traffic conditions and road surface condition.
The model also considers how changes in road condition and vehicle speeds affect operating costs over time. This allows HDM5 to estimate the savings to road users resulting from different road maintenance, rehabilitation and improvement strategies over the analysis period.
Economic Evaluation
Section titled “Economic Evaluation”The Economic Evaluation module assesses the technical and economic value of different road investment options over the analysis period.
It compares the costs and benefits of alternative road improvement and maintenance strategies with a Without Project (Do Minimum) scenario. Costs can include road construction and maintenance, vehicle operation, travel time, accidents and other impacts.
The module takes account of the timing of costs and benefits, converting them to comparable values using economic prices and a discount rate.
HDM5 calculates economic indicators such as Net Present Value (NPV), Internal Rate of Return (IRR) and Benefit-Cost Ratio (BCR). These results can be used to compare investment options, identify cost-effective solutions and determine which projects or investment packages provide the greatest value within an available budget.