Our highways are also very badly designed. They must have been smoking dope when they designed it. 3 lanes, then 4, then to 3 again. Lanes shifting, you are in a middle lane, then it becomes a right lane. Right lanes becomes a exit lane.. Exits and entrances every 2k, doesn't help volume. I am no civil engineer but that all that seems ridiculous.
It didn't used to be that way but has happened over the last several decades.
Right lanes should never disappear, only left lanes should end. (This should also be the same on passing lanes on two lane roads. Since right lanes end many people just stay in the left lanes and block passing or force people to pass on the right.)
..Tom