The effect of the Order is to temporarily prohibit all vehicles, other than those being used by the emergency services, from proceeding on a length of the A458 trunk road in Powys.
Effaith y Gorchymyn yw gwahardd dros dro bob cerbyd, ac eithrio’r rhai a ddefnyddir gan y gwasanaethau brys, rhag mynd ar ddarn o gefnffordd yr A458 ym Mhowys.