I go with the 57. The 57 operates in Newcastle,
Gateshead And Small part of North Tyneside.
In fact the 57 follows a route in where the councils have been told to reduce emissions on roads. Newcastle City Centre,Coast Rd and Parts around Gateshead. This overall makes me think that it’s the 57 which these are for.

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(06 Feb 2019, 4:53 pm)NewcastleOne wrote I go with the 57. The 57 operates in Newcastle,
Gateshead And Small part of North Tyneside.
In fact the 57 follows a route in where the councils have been told to reduce emissions on roads. Newcastle City Centre,Coast Rd and Parts around Gateshead. This overall makes me think that it’s the 57 which these are for.

And also the Tyne Bridge.