YES, if there is no breach of peace
If the driveway is on private property then in most states it is considered private property. Though laws differ still per state on this.
re-run. see above post
The state doesn't repossess your car - private companies do that on behalf of the lienholder. They don't charge you for private property left in your car when they repossess it - that would be illegal. They charge a "storage fee" for the items they remove from your car. Underhanded, yes, but they can legally do it.
It is against state law to open a locked gate.
No
First, repossesstion agents must be licensed and have a search warrant for whatever they want to repossess, but they are not police officers. If someone does not pay bills/taxes on any private property, they simply follow these steps: 1. let the owners know who they are and what they're doing and why 2. repossess what they were there to get 3. file a notice to the local/state police
If the repossessor is allowed in, yes. They cannot force their way into the community.
If a police officer records someone speeding, it doesn't matter what the nature of the property they take the reading from is. If they record you speeding while they're in a driveway, they can act on it. As for using a private residence, it's something which requires the consent of the property owner - they can't just occupy someone's driveway to set up a speed trap while ignoring the rights of the property owner, and it's often a discouraged practice, although California tends to have their own way of doing things.
Yes. If the lien is valid, a written contract is not necessary and the holder can legally repossess the vehicle in conjunction with the existing laws of the state in which the vehicle is located or in some cases where it was sold.
Using a private driveway to turn around without permission could potentially be considered trespassing. It is always best to seek permission from the property owner before using their driveway for any purpose.
An Authorized Recovery agent working on behalf of the lien holder can repossess the vehicle from the lessee. It is Illegal in the state of Indiana for someone who works for/ at the car lot or for the lien holder to repossess a vehicle under the car lot/ lien holder's company name. The duty of repossessing a car must be hired out to a recovery agency.
In most states a property owner can make his property subject to vehicle code enforcement. Then the violation is the same as if it had occurred on the street. If you did not have permission to use the driveway you could also be charged with trespassing. Vehicle codes vary quite a bit from state to state. Several of my friends and acquaintances died on motorcycles doing stunts and speeding on private driveways and lots. The cop may be doing you a big favor.