What is required of both lines in a two-line intersection during the approach phase?

In a two-line intersection during the approach phase, it is essential that both lines remain parallel to each other. This parallel alignment ensures that the teams can maintain synchronized movements as they prepare to execute the intersection. By being parallel, the skaters can effectively anticipate the spatial dynamics involved in the upcoming intersection, allowing for a smooth execution without misalignments that could lead to collisions or disorganization.

The requirement for parallel lines is crucial for safety and synchronization, as it keeps the teams visually aligned and focused on the same trajectory leading into the intersection. Additionally, maintaining a parallel formation allows skaters to deliver consistent speed and spacing, contributing to the overall fluidity of the performance. In contrast, the other options, such as staggering or intersecting at an angle, do not facilitate the same level of synchronicity and could potentially disrupt the execution of the intersection. Starting from the same point is also not necessary, as teams may approach from different positions while still maintaining parallel lines.