Most Illinois drivers likely know you need to pull over when a police officer initiates a traffic stop, but what if the car is unmarked? Regulations on unmarked law enforcement vehicles vary by state.

Kentucky police may use unmarked vehicles to conduct legal traffic stops. State law requires police vehicles to have blue lights and audible sirens. Unmarked police cars serve multiple roles, ...

ALBANY - Albany's full-time traffic officer is now patrolling streets and making stops in an unmarked dark blue 2006 Dodge Magnum. Police say that the unmarked car helps them stop aggressive drivers ...