Sut mae Llywodraeth Cymru yn bwriadu monitro effaith cyflwyno terfynau cyflymder o 20mya ar ffyrdd cyfagos?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 04/09/2023
The impact of the 20mph default speed limit on neighbouring roads will not be evaluated as part of the monitoring programme post national implementation. The Monitoring Framework will be published on the Transport for Wales website by the end of September.