That last bit is a good suggestion, but would probably require the toy to be driven over for full effect.This is too painful too for words.
Can we try and turn this into a thread about tips and tricks to keep children safe as a way to stop this happening again. Children will get out and they haven't developed the skills to evaluate risk - we need to help them and contain risks they are exposed to.
Maybe simple things like @Flossie telling the apprentice to drive slower, she knows - as we all do that children will get out.
My suggestion - put the child in a cab and lay their favourite toy in a blind spot, sit them on your knee and show them how easy it is to drive over it without seeing?