What should you do if you are involved in a crash with another car?

When you are involved in a crash with another car, the appropriate course of action is to stop and remain at the scene. It is vital to stay out of the traffic lanes to ensure your safety, as well as the safety of others. Turning off the ignition is also important to prevent any potential hazards, such as a fire. Contacting the police is crucial because they can document the incident, which will be important for insurance claims and any legal issues that may arise later.

This approach ensures that all parties involved are accounted for, and it allows for the accurate collection of information about the incident. Simply exchanging insurance information, as mentioned in another choice, may not be sufficient if the incident results in injuries or significant damage. Leaving the scene, as suggested in other options, is not only dangerous but can also lead to legal repercussions. Therefore, the correct response encompasses all necessary steps to handle the situation responsibly and safely.