ADAS stands for Advanced Driver-Assistance Systems. On a Rivian, that includes the windshield-mounted camera, corner radars, ultrasonic sensors, and the central computer that fuses them.
Whenever the geometry of your vehicle changes, the system needs to be re-aligned. That happens after collision repair, ride-height adjustment, windshield replacement, or sometimes major software updates.
Calibration has two parts. Static calibration uses physical target boards positioned to OEM measurements in a flat, level bay. Dynamic calibration is a controlled road test that lets the system verify its readings against real-world data.
Without calibration, your Driver+ may steer toward the wrong line, your AEB may misfire, and your blind-spot system may go silent. The cost is your safety. Insurance carriers increasingly require documented calibration for any qualifying claim.