Final answer:
When your car breaks down on an expressway, move to a safe location if possible, use hazard lights, and call for assistance while staying inside the vehicle with the doors locked until help arrives.
Step-by-step explanation:
If your car breaks down on an expressway, the first thing you should do is attempt to move your vehicle off the roadway to a safe location, such as the shoulder of the road. It is important to signal your intentions to other drivers by using your hazard lights. Once off the roadway and in a safe location, assess the situation. If you have emergency roadside assistance, call them for help. If it’s a simple problem that you can fix, such as a flat tire, do so only if it’s safe to proceed. Otherwise, stay inside your vehicle with the doors locked until assistance arrives. It’s also recommended to have an emergency kit in your car that includes items such as reflective triangles to further alert oncoming traffic of your presence.