“Nid mater o orfodi yw hyn yn unig – mae angen newid meddylfryd hefyd. Dros amser, 20mya fydd y cyflymder normal – yn union fel y cyfyngiadau ar ysmygu y tu mewn i fusnesau, codi tâl am fagiau a rhoi organau.
“This is as much about changing hearts and minds as it is about hard enforcement. Over time 20mph will become the norm - just like the restrictions on smoking inside businesses, the carrier bag charge and organ donation.