Multiple outlets report on a fact check regarding Wales’ proposed 20mph speed limit policy. The figure highlighted is an estimated £4.5 billion, which is presented as the total cost figure in the policy’s explanatory materials. Sources say the explanatory memorandum outlines both costs and potential benefits associated with lowering speed limits, rather than providing a cost estimate in isolation. The reporting focuses on how the £4.5 billion estimate is derived and what the accompanying documentation covers, including the range of impacts set out in the memorandum. While the summary details do not specify every component of the calculation, the overall message across the outlets is that the published estimate forms part of a broader assessment that includes both financial costs and expected effects from the change in speed limits. The fact-check coverage therefore frames the £4.5 billion as an estimate included in official explanatory documentation, alongside a wider set of arguments about outcomes, rather than as a standalone claim. All reporting remains centered on the policy document’s stated estimate and the way it is presented.