seat not in use

seat not in use

For some reason, I have seen a spate of "seat not in use" signs on London buses. This is for the tip-up seats that in the place where a wheelchair or buggy might go.

Seems to me, the core competency of a bus is to have seats, so people can sit down on their journey.

I suspect this has something to do with the Disability Discrimination Act. I don't know why. And, of course, I may be wrong. Always allow for being wrong.