Don’t get out of the car unless asked
Unless a cop asks you to step out of the vehicle, never leave your car. Getting out might lead an officer to believe you are being aggressive or are a threat to them. That said, if a policeman does ask you to step out of the car, you should do so. “Officers often ask people to “step out of the car” as a safety precaution—to make sure the driver doesn’t have any concealed weapons,” so if they ask, “it’s probably best to get out of the car to avoid a tense situation.”

Tell your passengers to pipe down
There should only be one voice in the car, and that voice should be yours if you are driving. If your friends are in the back seat tell them to pipe down while you handle the situation and speak to the police officer calmly. If your kids are in the car it’s a little harder to achieve silence, but you can assure them that everything is fine and ask them to be quite for a few minutes while you talk to the policeman.