Pryd gafodd llain ganol yr M4 rhwng cyffordd 45 a 46 ei hasesu ddiwethaf?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 02/05/2023
The central reservation barrier of the M4 between Junction 45 and Junction 46 was last inspected on 23 March 2023.