Pa werth ariannol y mae Llywodraeth Cymru yn ei roi ar hyn o bryd ar atal marwolaeth wrth werthuso polisïau a chynlluniau trafnidiaeth?
The Welsh Transport Appraisal Guidance (WelTAG) provides the framework for appraising transport interventions in Wales and is aligned with the Department for Transport's Transport Analysis Guidance (TAG). As part of this process, Welsh Government uses the collision and casualty prevention values set out in TAG and its associated data books, which are updated periodically by the Department for Transport.
There is no single value used across all transport appraisals. The monetary value depends on the transport scheme, the methodology applied and the costs being considered. DfT’s Data book assumes that the average value of prevention per fatal casualty is £2.65million. (Source: TAG Data Book: Table COBALT1 – May 2026 v2.03)