Having worked on both British and international projects I'd agree "cant" is the generally used term in the UK but "superelevation" is more widely understood internationally and UK rail engineers will understand it.
Incidentally 11° is a very large amount of cant. It is normally measured in distance of one rail above the other and by coincidence on standard gauge one degree is about one inch. The normal maximum is about six inches.
OMG...
It was just an example number because it was easier to write 11°. My finger was over the 1 key.
In more than 30 years on the track I have never used Degrees.
Always used Millimeters with a max of 150 mm unless on exceptional circumstances.
Superelevation as a term is used when liasing with Highways staff who use it on roads, or when explaining to non railway people.
That is exactly my thoughts too.
It depended on who you were talking to as to what you called it.
To somebody else on the railway it was the cant of the track or road.
Meanwhile, the road signs they erect call it "camber" instead.
What intrigues me is why there's a sign saying not to change the cant on that bridge, and not just a note in the paperwork for it. Could someone just wander along during a posession, decide that the cant was wrong, and start doing something about it there and then?
I would say its more likely due to some engineering works past of in the future. you would make things of importance out...
For example, and this is not to mean it is specific in this exact situation and not to say its done every time either. Its just a possible explanation of it.
You are told in your notes that the level of the track there is most important and that during the rail relay the track level and cant can not be changed from what it is, so you would mark it so the crews know the track there must go back to the original levels.