What is the primary purpose of the LATCH system in vehicles?

The primary purpose of the LATCH system, which stands for Lower Anchors and Tethers for Children, is specifically designed to aid in the installation of child safety seats. This system provides a standardized method for attaching child safety seats in vehicles, ensuring a more secure fit compared to using just the vehicle's seat belt. The LATCH system includes lower anchors that are built into the vehicle's seat and tether anchors that help stabilize the child seat by connecting it to the vehicle's structure. This setup minimizes the possibility of incorrect installation, which is a critical factor in ensuring the safety of child passengers during travel.

Other options relate to vehicle functionalities that do not pertain to child safety. For example, installing GPS systems, securing luggage, or enhancing audio systems are unrelated to child passenger safety and do not serve the purpose of providing a safe environment for children while traveling in a car. Thus, the focus of the LATCH system on child safety seat installation makes it the correct answer.