My DS2 is 3 (4 in November) he has been out of a pushchair for 6 months but is a nightmare outside (see here for back story)
Today was the last straw he was waiting in the Park with my sister and her baby while i nipped into the school to collect our kids, my sister turned her head to see to the baby and DS legged it across a busy main road into the school, luckily he wasnt hurt or kidnapped or anything, my poor sister was in hysterics becuase she thought she had lost him.
Im have had enough, i honestly dont know what to do anymore so i brought a cheap buggy to keep him strapped into.
I know its not a long term solution but its only matter of time before he gets run over or abducted or something.