You can never tell how good the knowledge of a cab driver or a car service driver is. Usually I find the cab drivers have a much better knowledge of where to go and how to get from point A to point B and also take in consideration how traffic is during different parts of the day. But with car service guys I take home from work late at night I usually give them directions each time to be on the safe side. If I start off and they say that they know then I’ll back off. But sometimes they’ll start to take the wrong bridge into Brooklyn and it’s just silly. It never fills you with confidence when the more premium service seems to have more shortcomings than the alternative.