Under these conditions, I don't understand why it matters how big the car is. Teach your children not to cross the road.
I spent hours roaming the streets on my bike as a kid in Germany, now I hear my coworkers saying things like "I don't leave my 10 year old unsupervised for more than 10 minutes. If I have to go somewhere, he's coming with me."
It leaves me flabbergasted.