A wnaiff y Gweinidog ddarparu'r sail ar gyfer y cyfrifiadau a'r data sy'n cefnogi amcangyfrifon Llywodraeth Cymru ar gyfer y costau sy'n cael eu harbed i'r GIG yn sgil y polisi 20mya?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 27/09/2023
The calculation for the data which supports the estimated cost saving to the NHS as a result of the reduction in default speed limit to 20mph can be found in the Edinburgh Napier Report. They estimated that there would be a 40% reduction in casualties which consequently would result in savings for the NHS.