Traffic volume in 2019 had remained the same compared to previous year on A trunk roads, increased by 1.0% on A county roads and increased by 2.0% on motorways.
Arhosodd swm y traffig yn 2019 fel ag yr oedd yn y blynyddoedd diwethaf ar gefnffyrdd A, ond gwelwyd cynnydd o 1.0% ar ffyrdd sirol A ac o 2.0% ar draffyrdd.