Thank you all so very much for your replies! This was exactly what I expected and passed most of them on to my husband.
Im on my iPhone and there were so many things I wanted to quote to say particular thanks to, for example the real life stories, how utterly heart breaking and all of your experiences too. I am going to sit him down tonight to read them.
His excuses are
1 our son loves it
2 it's a short drive and he is going slow
3 he never sees another vehicle ever on his way to day care
I think my dh likes being 'fun dad' and didn't really think about the ramifications - no excuse though.
Whilst crying and reading him the few responses I had last night he promised he wouldn't do it again and was so hurt by the fact I thought he would ever put our son in danger ( I quickly pointed out that was exactly what he had done twice)
Also I think he thought woman would be more like me, where I worry about our sons welfare all day every day and he is very relaxed and carefree (prob why I worry so much) and if I left him and we weren't together I assume he would be more reckless because he wouldn't have to answer to anyone.
I can only think he thinks other 'men' are relaxed and could see I was over exaggerating and that the risk was that small it would never happen, I told him once is all it takes. So please keep replying, I really mean it when I aid I'm going to get him to read this. The funny thing is I feel I will be punished in some way for making him feel bad or like a bad dad. By punished I mean told he is never picking him up or dropping him off which may sound like a blessing and would ultimately let me relax knowing my son is safe would also put me in a tight situation as he would get dropped off early and picked up late, which is time he could spend with his dad.
Anyway enough rambling from me, I really appreciate your replies.