This paper proposes a method to reduce the risk of collision in cut-in situations, which enhances the performance of Cooperative Adaptive Cruise Control (CACC) in terms of safety. In the proposed control method, the turn signal of the cut-in vehicle is used to create a virtual vehicle such that the cut-in is handled smoothly and safely in advance. This method increases the safety of the CACC system in cut-in situations with a platoon of vehicles.