Bizarre confusion for a contradictory world

Usually I don’t have my cellphone with me when I’m out walking or jogging. On one strange morning, however I did (that’s another long story). Anyway, startled by a sign I took this photo:

So, crossing the road to use the other side, I found this:

It doesn’t make too much sense to me (I’m sure a robot would expend its batteries crossing back and forth). I guess in some kind of bizarre logic it works – really it was only a short section of the footpath on each side closed, but it did appeal to my sense of humour.