I hate when cars all drive the same speed and end up making one giant road block. It's really annoying when you have other drivers who want to pass but can't b/c oblivious, unaware drivers don't realize that they are driving right next to someone.
It's also dangerous to do that. I never feel safe when I'm driving next to someone which is why I will speed up just slightly to get out of their blind spot or just being next to them.
Here's one example of it happening to me recently. There was this new toll road open which allows you to go 85mph. For most of the trip, I was able to pass anyone not going 85mph (I had cruise control at 85) and all was good....except for one car who was also going around 85, but for whatever reason, I could not get any space/distance between us. He tries to pass me, I try to pass him, etc and somehow he ends up right next to me still. At 85mph, it's damn well not safe to be driving right next to someone. I even try to purposely speed up or slow down to give him space, but he somehow ends up right back next to me. This happened over the course of probably 10-15 miles. I think he ended up exiting at some point but my goodness was he so oblivious to his surroundings.