That reminds me of a motorcycle trip I had to Ireland at the back end of the 80's.
Cornwall to Fishguard, across to Rosslare then onto the southwest to get the MacGillycuddy Reeks. But I had to stop over in Tipperary to visit about 50 relatives (and according to my Mum, if I missed one, it would cause a 500 year feud.)
So with a long day behind me, I was trundling toward Tipperary and a signpost appeared saying Tipperary 20. A bit further down the road another signpost said Tipperary 25. Baffled I wondered if I was 180 degrees off course.
But apparently they were changing from miles to kilometres and the signing was in transition, and when I asked my relatives in Tipperary what this was all about, they told me:
'Those are Irish miles.'
Some were 'anti-miles' and these cancel out normal miles. Bit like matter and anti-matter without the explosion.