Why do teams use line trackers?

As the topic states, I was wondering why teams have been using line trackers on their trays? I’ve seen many teams (not in person) using them and was just curious as to what they exactly do.

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Most teams using line sensors on their trays use them for detecting when a cube is over a certain point on the tray. It can be very useful for positioning cubes in your intakes for towers.

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