A 20mph speed limit outside the school won’t protect children for the whole journey as they walk or cycle from home, it would only protect them near the school.
Ni fydd terfyn cyflymder o 20mya y tu allan i'r ysgol yn gwarchod plant ar gyfer y daith gyfan wrth iddynt gerdded neu feicio gartref, dim ond ger yr ysgol y byddai'n eu gwarchod.