[PapaBear3625]

The interstate I commute on has the flow of traffic being 80 mph, regardless of the fact that the speed limit is 55.

People tend to travel at what they consider a safe speed, which on a freeway tends to be 80. I would not be traveling faster than 80, even on an unlimited-speed highway, because that's the max safe speed for my car and my reflexes.

[Tribune7]

People tend to travel at what they consider a safe speed,

BINGO!!

And unless you are teenage male the speed at which you choose to travel is likely to be a safe one.

[Arrowhead1952]

People tend to travel at what they consider a safe speed, which on a freeway tends to be 80.

I drive on US 183 to and from work every day. I usually drive 65 which is the posted speed and stay in the right lane the entire commute. The left lane is often running at 75 or more, and the center is at least 65 - 70. About two weeks ago, some idiot in a Ford F250 decided he had to drive faster, so he passed on the right shoulder at about 80 MPH.