The only stand which complies with current regulations is the RDS
The others do not comply with the current regulations which means they will eventually be forced to have their capacities restricted or at worse be closed. F
Some Building Regulations can be worked around but in 'non domestic' buildings this is very hard and the alternatives are oftern more costly.
Safety certificates, Licenses etc on the other hand will shaft the club eventually. They may have a stadium but they will only be allowed to let fans into one stand.
Hillsbrough thankfully destroyed the neglegence and ignorance of sports clubs, HSE etc when it came to stadium maintenance and design.
This discussion about pittodrie redevelopment seems to come around on an annual basis and it fascinates me the number of people (sometimes its the same ones) who come back either claiming things such as 3 sides of the stadium is fine or a modern 8000 seat & 3500 seat stands can be built within the same footprints as the South or Merkland/ Mains.
Yes you can have a road running underneath a stand. What you can't have is that road being a primary access to other peoples property especially when said property is residential.