There are a limited number of books on the market that do a good job of making Six Sigma tools accessible for the transactional world. This is one of the few.
Windsor does a really nice job of giving an overview of how Six Sigma can be applied in transactional environments, using situations like your morning commute as an example. He gives a great overview of simple tools like Pareto charts, cause and effect diagrams, process controls and assorted statistical tests.
My focus for this blog is to apply Lean and Six Sigma directly to HR. Windsor is not as focused, so his text is more generic when it comes to applications. That said, it might be the best resource out there for understanding the applications in a simple way.
I keep 10 copies on my bookshelf and hand them out like candy to visitors. If you come visit, you can have one. If not, I suggest you go get your own. Its under 150 pages, so you can get through it quickly and come back as needed. I promise you it will be worth your while.