Driving too fast is, obviously, extremely dangerous and a stupid thing to do. Driving too slowly is also dangerous and stupid. I drive at the speed limit and I frequently find myself stuck behind a driver who is driving 15mph in a 30mph zone. I assume they are having a conversation on their phone, or texting, or are otherwise distracted. Or just thoughtless and a poor driver. Whatever is going on, the frustration of being forced to poke along behind some dork is infuriating.