Driving means control. This dream implies that the dreamer lacks self-confidence and feels that he lacks control, so something will happen.
Dreaming of killing a child reflects the dreamer's inner remorse and punishes himself in his dream to make up for his past mistakes. Similarly, this sense of self-blame comes from the last two accidents, and dreamers still blame themselves for being careless.
Generally speaking, this dream has no bad omen, just reminding the dreamer to adjust his mentality and not to let past experiences become his psychological burden. The more anxious the dreamer is, the greater the chance of an accident, so it is most important to adjust the mentality.
This dream also reminds the dreamer to drive carefully and not too fast. As long as he tries his best and has a clear conscience, he shouldn't think too much.
Good luck!