it would be over 1 metre high and next to a highway used by vehicles (or the footpath of such a highway); or over 2 metres high elsewhere; or
os yw’r ffens, y wal neu’r gât dros 1 metr o uchder ac wrth ymyl priffordd a ddefnyddir gan gerbydau (neu lwybr troed priffordd o’r fath); neu os yw dros 2 fetr o uchder mewn mannau eraill; neu