NTA Appraisal Toolkit
The NTA Appraisal Toolkit is an integrated suite of modules for the appraisal of social, safety, health, environmental and economic impacts of transport interventions.
The Appraisal Toolkit consists of 5 modules:
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Environment Module
The Environmental module calculates emissions based fleet make up and vehicle speed for each road link in the model. Calculations are carried out by ENEVAL using COPERT 5 emission rates.
The Environmental Module outputs emissions by link, zone, sector or grid, which allows results to be mapped in GIS. The emissions estimated include NOx, NO2, PM10, PM2.5, HC, CO, CO2, C6H6, CH4, C4H6.
Figure: Annual CO2 Emissions (kg) in the ERM
Further detail can be found at the Development report and User guide:
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Economic Module
The Economic module calculates the economic costs and benefits of transport interventions. In essence, it is an Irish version of the UK DfT TUBA (Transport User Benefits Appraisal) program.
Standard outputs of the Economic module:
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- Scheme costs
- User costs
- Fuel consumption
- User benefits and government and operator revenues
- Benefits by distance and by time saving
- Transport Economics and Efficiency (TEE) Table
- Analysis of Monetised Costs and Benefits
Further detail can be found at the Development report and User guide:
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Health Module
The Health module calculates benefits associated with changes in levels of physical activity and absenteeism as a result of more walking and cycling taking place. The module is based on the relevant UK DfT tool for physical activity assessment. Standard outputs of the Health module:
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- Total Collision Benefits Saved by Scheme
- Total Collisions avoided by Scheme
- Total Lives Saved with Scheme
Further detail can be found at the Development report and User guide:
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Safety Module
The Safety module uses a bespoke version of the UK DfT COBALT (Cost and Benefit to Accidents – Light Touch) for assessing the impact on accidents (economic appraisal) of a road scheme. Standard outputs of the Safety module:
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- Total Collision Benefits Saved by Scheme
- Total Collisions avoided by Scheme
- Total Lives Saved with Scheme
Further detail can be found at the Development report and User guide:
Validation Test: Annual Road Fatalities
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Accessibility and Social Inclusion Module
The Accessibility & Social Inclusion (ASI) module assesses the relevant impact of a transport scheme based on travel time, a simple Hansen index, and an income-based geographic indicator. Standard outputs of the ASI module:
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- Travel time benefits
- Deprivation Index
- Simple Hansen measure
Figure: Walk times for access to Primary Schools in Dublin
Further detail can be found at the Development report and User guide: