Pa dystiolaeth wnaeth Llywodraeth Cymru ei defnyddio wrth ystyried terfyn cyflymder 20mya?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 23/11/2022
An independent 20mph Taskforce Group was set to investigate the evidence and implications for the adoption of 20mph on restricted roads, across Wales. Then when the legislation was laid a full impact assessment was submitted as part of the Explanatory Memorandum.