Hi Katherine, thanks you for asking another question in the forum.
There is no consideration to the distance a pole goes down into a socket below ground. Signal poles usually have a standard amount (unlike sign poles), and it is the socket that can be adjusted deeper in the ground. For this reason you will see that the socket does have a foundation volume that can be modelled in 3D in KeySIGNALS and the socket depth can be adjusted.
Alan Mason, Product Manager, Keysoft Solutions.