Official Q&A: VRC 2019-2020: Tower Takeover
396: <SG1> Legal starting location
<SG1> Starting a Match. Prior to the start of each Match, the Robot must be placed such that it is: a. Contacting the field perimeter wall on the side that coincides with their Alliance's Goal Zone and Alliance Station.
Does "on the side that coincides" refer to the 12ft of field perimeter directly next to the Alliance station? or does "SIDE" refer to the entire half of the field on that Alliance's side of the field?
The first interpretation give a little less than 12ft of perimeter wall to start on.
If its the later interpretation, FIELD side, that gives an additional length of wall to start on (extending towards the center autonomous line on each end of the field).
Does "on the side that coincides" refer to the 12ft of field perimeter directly next to the Alliance station? or does "SIDE" refer to the entire half of the field on that Alliance's side of the field?
Your first interpretation is correct.
Although "Starting Wall" is not a defined term, Figure 3 in the Game Manual denotes the side that is parallel to the Alliance Station / Autonomous Line as the intended starting position to help make SG1 more clear. The walls that are perpendicular to the Alliance Stations / Autonomous Line are not considered "coincident" with the Alliance Station, and are not valid starting positions.