Self-righting bus rear hub

[Anex]

This is going to be a vague question, but it's troubling me... I've noticed some buses have self-righting hubs at the rear, usually with a blue sticker on and I want to know why - what is the advantage / reason?

My Googling only turns up Rolls Royce references or full float axle references, but afaik a full float axle doesn't require anything to be self-righting. Anyone know what it's all about?

 

[Tony L]

If you turn the bus upside down will it self-right like a lifeboat?

 

[Anex]

Yes. But more like an empty bottle of Oasis, end to end.

 

[martin clark]

Hubometer. Not nearly as exciting as Tony's idea.

 

[Anex]

Ahh thanks, looking at that page I think I already knew that

Presumably they could add a feature to let you know whether the vehicle is the right way up.