Speeding is straightforward to determine, just check the speed limit and how fast you were going. Reckless driving is a judgement call. Going to far over the speed limit means you'll probably get a reckless driving ticket if caught. But speeding isn't necessary for a reckless driving charge.

It looks like court precedence is really important in some areas of tax law in determining what's ok. It's a problem if someone can take a really novel and beneficial reading of a policy and assume they won't have to defend it.