No, you just need to download the ATSMP mod itself. The cars were placed in the update.
Police cars are strictly for admins, so don't add any of the following to your car other wise you'll be disconnected to offline status soon as you leave the shop.
Police Paintjob
Blue LED's
Blue Light Bars
The following above are all registered as police equipment.
The only thing you can put on a car light wise is the yellow light bar with the word pilot on it. Also the pilot paintjob is okay to use on your car.
Speedy is correct. Details of the following police classifications include: Blue LED's, Blue lights on the roof of any variant.
The only light you may use at all is the pilot light which is the yellow one with the word pilot on it.
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That with us assuming you downloaded the new version either yesterday or today. One thing I happen to notice is I used to launch it and let it redirect me to their website, but this update will not redirect you from launching the game. It'll disconnect you to offline status. So you have to go to the TruckersMP website yourself and hit download.
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If none of this is solving your issue, then a support ticket would probably be the next step to follow, so it can be assisted by someone quicker who has access to more information than we do.
http://truckersmp.com/support/
Visit that website and simply click on Submit A Ticket
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JoeBraddock's post in Politi car in ETS2 multiplayer was marked as the answer