Police are AI cars in American Truck Simulator and Euro Truck Simulator 2. If players commit an offence in the presence of a police car (exceeding the speed limit, running the red light, colliding...), they will receive a fine. The police car will sound its siren and flash its light-bar for several seconds; once the player pays the fine, the sirens and flashes will turn off, and the police car will continue its original path.
If the player commits an offence in presence of the police, the fine given is twice as high.
Some police cars exist both in a sedan and a hatchback variant.
As of Special Transport DLC, the cops will clear a path by blocking traffic to allow Escort Vehicles and your truck to pass.
Portland Police Bureau cars in the Oregon DLC were, for a while, designed wrong. SCS had instead mistakenly designed the police cars as Portland, Maine police vehicles instead of Portland, Oregon police vehicles. The Interceptor Sedan variant is also designed wrong, as the drive is also on the left side instead of the right side.
In TruckersMP, if a trucker collides with another trucker, spams their horn or lights, dangerously overtakes other drivers, recklessly drives, or blocks the road in the presence of a police car driven by a server admin, then the admin will kick out the trucker depending on what they saw or on reports by a player who is the victim or is the witness of a crash. Notably, admins do sometimes use trucks or freecam instead of police cars.