Mae heolydd Cymru yn saffach hefyd i blant - gyda gostyngiad o 15 y cant yn nifer y plant o dan 16 oed ac 16 y cant o ostyngiad yn nifer y bobl ifanc (16 - 24 oed) gafodd eu lladd neu'u hanafu o'u cymharu â 2016.
Welsh roads were also safer for children – with a 15% decrease in casualties of those aged under 16, and a 16% fall in young people casualties (aged 16 – 24) compared with 2016.