Right now, due to flood defence work, we have a lot of road diversions. On the main road south from here there is a crossroads with a minor road. As you approach the junction along the main road there is a big sign with an arrow pointing to the right, towards the minor road, and stating `Road closed ahead. Diversion'. To me, that means turn right onto the minor road because the road ahead, the main road, is closed. But the actual situation is the opposite the minor road is shut and you can carry on ahead.
