Subaru almost certainly uses radars for both cruise control and blind spot detection. Your link isn't exactly a white paper, here's a Subaru link that mentions

Subaru almost certainly uses radars for both cruise control and blind spot detection. Your link isn't exactly a white paper, here's a Subaru link that mentions radar: https://www.subaru.com/vehicle-info/articles/what-is-adaptive-cruise-control.html https://www.subaru.com/vehicle-info/articles/what-is-adaptiv...