The report also concluded that in areas where 20mph was introduced there has been more children walking, cycling, and scooting to school.
Daeth yr adroddiad i'r casgliad hefyd fod mwy o blant wedi bod yn cerdded, beicio, ac yn mynd ar sgwter i'r ysgol mewn ardaloedd lle cafodd 20mya ei gyflwyno.