Accident assessment is undertaken using the ACCDNT software package. The ACCDNT model conforms to the NESA/COBA (Network Evaluation from Surveys and Assignments/Cost Benefit Analysis) conditions set out in the 2002 NESA Manual in the Design Manual for Roads and Bridges. The accident forecasts include number of accidents by severity, cost of accidents and distribution of accidents by area (local authority, regional and national level).
Accident analysis can provide quantitative evidence for the ‘Safety' element of a STAG appraisal and can also be useful when designing safety improvements and launching safety initiatives etc.