Simple, the projected path of the car. If it follows the Blue prediction it hits the curb, which it did.Where is the prediction? What specifically is the indicator? Curbs are always red and there is a cone here so it is definitely visualizing that.
EDIT: Just to add as the curb went "out of view " of the front cameras it suddenly regresses farther back, probably meaning the Tesla misjudged it at the last second. Time stamp 11 second to 12 seconds.
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