I didn't yet understand how completely insane the situation was. The first couple cars just swerved or honked and went past without stopping, but a lady driving a VW Beetle was slower to react and slammed on her brakes, skidding and swerving and barely missing him. I can remember seeing him run out in the road, facing her with his arms out and an excited look on his face.
The lady driving was completely beside herself, screaming and crying as she ran over to him, demanding to know what was going on. Simon confessed and also told her about me hiding nearby, and I remember being terrified as she grabbed his arm and ran over to me, still shouting and sobbing all at once. She was (understandably) just completely out of control and she marched us up the road to our houses to tell our parents.
I wasn't allowed to play with Simon again and I think that was the day I realized that cars and driving were deadly serious, and nothing to joke around with. For me it was mostly seeing the reaction of the lady driver and trying to comprehend why she was so upset. Looking back on it, I feel sorry for her and for Simon's parents, because they must have had a hell of a time raising him. Strange the things you remember from childhood, but fortunately most people turn out OK.