I live in a suburb of Tel Aviv. Every morning during rush hour the two streets leading to the highways to Tel Aviv are packed. I try to evade going to the university during rush hour. Unfortunately, the kids start school at 8:30, and therefore quite often I have to trail to Tel Aviv with many other sleepy parents.

In some countries drivers  keep their lane while driving in a multi-lane packed street. This is not the case in Israel. People believe that by changing lanes they can get to their destination faster, even when all lanes in the roadway are equally packed. Plainly one can rationalize this behavior, as one lane may be momentarily faster than the other, and therefore by changing lanes one can progress a little faster.

The streets leading from my home town to the highways consist of four lanes, two lanes leading from the town center to the highway, and two lanes leading from the highway to the town center.

The other day I was going to the University, and the two lanes leading to the highway were packed as usual. I noticed that the car in front of me tries to change lanes. Then I noticed that the car in the other lane also tries to change lanes. Thus, each driver believed that the other lane is faster than his own lane. As they were driving one next to the other, their intentions were common knowledge among them. But then, as Aumann tells us, it should be common knowledge among the two drivers that both lanes are equally slow. Nonetheless the two drivers switched lanes.

Anyone has a good explanation?