The total road length in Wales in 2020-21 was approximately 35,020 km, an increase of 0.4% on the previous financial year (2019-20).
Mae cyfanswm y pellter a deithiwyd yng Nghymru mewn bws yn 4.0% o’r holl gilomedrau gan gerbydau ym Mhrydain Fawr ar gyfer 2019-20 (siart 9).