There are currently two widely-used tools for calculation of carbon (greenhouse gas) emissions from road vehicles in appraisal. DEFRA’s Emissions Factors Toolkit (EFT) is primarily designed for calculating emissions that affect local air quality, but it covers carbon as well. It is updated periodically for fleet compositions and other technical factors – but less often than the TAG databook. The alternative is TUBA (Transport Users Benefit Appraisal software), which calculates...
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