Self-driving cars can be as stubborn as a mule. Sometimes it seems as though a car is about as stubborn as a mule or perhaps acting bull-headed. Here's an example of something I witnessed first-hand the other day. A tow truck was getting ready to take a car for a tow. This was a flatbed style tow truck. You've surely seen these types of tow trucks on the roadways wherein they piggyback a car that needs to be transported. The tail end of the flatbed portion tilts at a somewhat acute angle to allow for driving a car up onto the riding platform. This forms a ramp for the car to traverse upward onto the empty and awaiting flatbed area.