Desperately need help. My 3, almost 4 year old, keeps running on the road. I've tried everything and nothing works. I pick him up from nursery and all the other kids are walking with their parents happily, my son throws himself onto the floor if I try to grab his hand, he always runs away from me and ALWAYS into traffic. I hate taking him places because I'm terrified something will happen to him. I want to trust him, but I can't.