A transposition tower allows these sections to be connected together, while maintaining adequate clearance for the conductors.
This is important since it distributes electrical impedances between phases of a circuit over time, reducing the problem of one conductor carrying more current than others.
Double-circuit lines are usually set up with conductors of the same phase placed opposite each other.
The next section may be B-C-A on the left, also A'-C'-B' on the right.
Therefore, the rotation on each side of the tower will be opposite.