General warning signs are at the entrance and in many cases will be reinforced by smaller 'pictogram' repeater signs identifying specific hazards at individual monuments.
Ceir arwyddion rhybuddio cyffredinol wrth y fynedfa ac, mewn llawer o achosion, fe'u hategir gan arwyddion 'pictogram' llai o faint sy'n nodi peryglon penodol sy'n ymwneud â henebion unigol.