A collision avoidance system (CAS), also known as a pre-crash system, forward collision warning system (FCW), or collision mitigation system, is an advanced driver-assistance system designed to prevent or reduce the severity of a collision. System applied brakes bringing our Unit to a complete stop traveling 55 MPH on an Interstate while making a lane change, Because of this our Unit was rear-ended by another CMV, On board cameras video on both V1 and V2 clearly show incident. A print out of the DDEC shows code for braking system control at exact time of incident. In our fleet we have the same 2020 Freightliner Cascadia with this system and in trying to maintain the safety of our drivers and equipment no to mention our Insurance cost and CSA scores, This is a major issue as you can see on the Web the many cases and stories of these same incidents happening. Direction is needed Thank You