That's an increased risk of accident, but not a big danger. In your scenario, you're getting rear-ended at 10 mph. That's unlikely to cause a serious danger, wh

That's an increased risk of accident, but not a big danger. In your scenario, you're getting rear-ended at 10 mph. That's unlikely to cause a serious danger, whereas there is a real difference in surviving a crash at 70 versus 75.