I'm not sure how anyone could "pull over" a car that was parked. Police can investigate a parked vehicle that is parked unlawfully or that appears suspicious. If the car is in a public place, an officer would not require any probable cause to look at it more closely than he could by just driving by. If the car is occupied, he can ask to speak to the occupants. The occupants don't necessarily have to talk with him.
Parenthetical Comment: As an F.Y.I. - - even if the car is 'parked' - if it is occupied and someone is sitting behind the wheel, then that person is deemed to be "in control" of the vehicle whether or not it is moving or the engine is running.
No, civilians cannot pull over a police officer. Only law enforcement officers have the authority to pull over vehicles.
Police can pull a person over for numerous things such as speeding, no taillights, a headlight out, or swerving.
A citizen can not pull over a police officer for bending the law, but you can report them to the superiors of their Police Department.
Yes, a police officer from a different state can pull you over if you are driving in their jurisdiction.
The police may have turned on their lights to get your attention or signal you to pull over, but they did not actually pull you over for a specific reason. It could be a warning or a precautionary measure.
Yes, an unmarked police car driven by a police officer in plain clothes can legally pull you over for a traffic violation.
Yes.
Yes.
Yes, a police officer can pull over multiple vehicles at once.
There is no need to pull over for an emergency vehicle using its lights and siren if you are already parked or idling on the side of the road.
Yes!
Yes