We here in Ireland were the same in that regard. A few years ago, we just decided to abandon the use of dual units and switch to using km everywhere. Within a s

We here in Ireland were the same in that regard. A few years ago, we just decided to abandon the use of dual units and switch to using km everywhere. Within a short amount of time, people had mostly switched over to using km for any non-trivial distances. It can be done; it just takes the determination to just do it.