There is some debate online over the correct numbering of this road - generally it is marked as a spur of the M90 on most maps. The case for ref=A92(M) is based on a page from Pathetic Motorways which infers from the technicalities of ambiguous signage. There is and afaik never has been signage on the ground to indicate that this stretch of road is numbered A92(M) therefore it is my opinion that ref=M90 would be most appropriate.

Given the original contributor @LogieBear20 has not responded to @GinaroZ in over 2 months with a reason for this change, I will revert to ref=M90.

Sources:
https://www.sabre-roads.org.uk/wiki/index.php?title=A92(M)
https://pathetic.org.uk/secretive/a92m/