How can you ensure your safety while attempting to restart your vehicle in traffic?

Ensuring safety while attempting to restart your vehicle in traffic is crucial, as it helps not only protect you but also other road users. The option highlighting the combination of measures is correct because employing multiple strategies significantly enhances safety.

Staying inside the vehicle with your seatbelt fastened is vital. This protects you in case of an accident and allows you to remain in a controlled environment. Exiting the vehicle can expose you to various hazards, such as oncoming traffic or other road users who may not see you.

Turning on your hazard lights is also an essential step. This action alerts other drivers that you are experiencing an issue and encourages them to approach with caution. It provides a visual warning that helps to reduce the likelihood of a collision while you're attempting to restart your vehicle.

By combining these actions—remaining in the vehicle with your seatbelt fastened and activating hazard lights—you create a safer scenario for yourself and those around you. This multi-faceted approach is key to managing the risks associated with vehicle failure in traffic.