The appraisal modules provide a full suite of appraisal tools in line with national guidance. They interact with the Regional Modelling System to extract the necessary data required to appraise schemes, policies and strategies.

Environment

The Environmental Appraisal Tool employs Cube Voyager and ENEVAL (Environmental Evaluation Model) to estimate environmental impacts of transport related to:

  • Emissions of air quality pollutants
  • Emissions of greenhouse gases

The Environmental Specification Report can be viewed by requesting the report from ntamodel@nationaltransport.ie.

Figure of annual CO2 Emissions (kg) in the East Regional Model. Figure: Annual CO2 Emissions (kg) in the ERM

Safety

The Safety Tool conducts an analysis of the impact of road accidents for transport schemes. The process is based on TII’s updated COBALT software. The safety appraisal is based on a comparison of the number of accidents on the transport network by severity and associated costs between a ‘With-Scheme’ and ‘Without-Scheme’ forecast scenario.  The inputs into the process are modelled road network characteristics such as link type, road length and speed limits, as well as accident rates and costs, and modelled forecast traffic volumes.

The Safety Specification Report can be viewed by requesting the report from ntamodel@nationaltransport.ie.

Figure of average annual fatalities by regional model and road.
Health

The scope of this Health Appraisal Tool is to provide the basis to calculate benefits associated with changes in levels of physical activity and absenteeism as a result of more walking and cycling taking place. The basis of the health module is the tool developed by the WHO, the Health and Economic Appraisal Tool (HEAT). It calculates the health benefits associated with changes in physical activity resulting from differences in walking and cycling.

The Health Specification Report can be viewed by requesting the report from ntamodel@nationaltransport.ie.

Economic

The Economic Appraisal tool uses TUBA software to perform a Cost Benefit Appraisal with DTTAS guidance and parameters.

The main outputs from the Economic Appraisal module are:

  • Sector to Sector costs and benefits
  • Benefit to Cost Ratio (BCR)
  • Monetised benefits of the scheme for a 30 year period.
  • Accessibility and Social Inclusion

The Economic Specification Report can be viewed by requesting the report from ntamodel@nationaltransport.ie.

Accessibility and Social Inclusion

The Accessibility and Social Inclusion Appraisal Tool uses three measures are used to assess accessibility and social inclusion changes between a ‘With-Scheme’ and ‘Without-Scheme’ forecast scenario.  These are: a Travel Time Measure and a Simple Hansen Measure for the Accessibility assessment, and an Income-based Geographic User Benefits Indicator for the Social Inclusion assessment.

The Accessibility Specification Report can be viewed by requesting the report from ntamodel@nationaltransport.ie.

Figure of walk times for access to Primary Schools in Dublin