Well, it’s still in the future, but the era of self driving cars is fast approaching. Until then your best bet is hiring a 100% real human Chauffeur that knows the Seattle area, has years of experience to back up his or her professional driving skills and will get you to and from where you need to be.
If you want a peak at the future (maybe), take a look at the San Francisco Chronicle article on driverless limo service – is that a good thing?