"We arbitrarily chose a number so we could feel like we were making improvements. Nothing justifies 5 over, say, 3, or 10. When cars are in fact 3x safer, all

"We arbitrarily chose a number so we could feel like we were making improvements. Nothing justifies 5 over, say, 3, or 10. When cars are in fact 3x safer, all those saved lives won't be saved, because our arbitrary 5 has yet to be reached." This is meaningless and bad.