“This new research shows the savings in terms of reductions in people being hurt or killed but the benefits of 20mph stretch much further than casualty savings alone.
“Mae’r ymchwil newydd yn dangos yr arbedion o ran gostwng y nifer sy’n cael eu lladd neu eu hanafu ond mae manteision y terfyn o 20mya yn golygu llawer mwy na hynny.