Sure, it makes sense to the actor himself. But to an external observer (say, who's going to the same destination) such choice does not follow common reasoning

Sure, it makes sense to the actor himself. But to an external observer (say, who's going to the same destination) such choice does not follow common reasoning (arriving at the shortest). Gains of such choice are intangible (indeed personal satisfaction is subjective). At the same time, the 'loss' is very specific and measureable (extra time, fuel etc.) Thus in the context of a common measure such choice could be seen as irrational, especially when a rationally optimized choice is equally available.