Under section 137 of the Highways Act 1980, it is an offence for a person, without lawful authority or excuse, to wilfully obstruct the free passage along a highway in any way.
O dan adran 137 o Ddeddf Priffyrdd 1980, mae’n drosedd i berson, heb awdurdod neu esgus cyfreithlon, rwystro’n fwriadol y llwybr rhydd ar hyd priffordd mewn unrhyw fodd.