When initiating a traffic stop, you communicate wit hthe driver using the megaphone or the police lights for the vehicle to pullover.
Firstly ensure that you are not stopped on an intersection, on a tight corner or other dangerous person, if so communicate with the driver that they must be stop elsewhere.
When the vehicle comes to a stop, assure you align the center of your vehicle with the left tail light of the other vehicle to ensure your safety when out of the vehicle. Before exiting your vehicle make sure to make dispatch aware of your traffic stop by communicating with them over the radio.
When approaching the vehicle, eye for the suspicious or dangerous objects either in the drivers hand or in the back seat, as you approach the rear vehicle, tap the left tail light with one of your hands to leave your fingerprints on the vehicle.
Then approach the driver, if you spot nothing dangerous or suspicious, stay slightly behind the driver, behind his left shoulder when asking him questions. This is the most tactically advantageous position. In this position you are the least vulnerable to attack by the driver or occupant of the vehicle.
Additionals must always line up behind the lead vehicle.
To communicate your vehicle stop over radio, every Police Officer must adhere to the following form. It's called the C-Y-M-B-O-L method to communicate your vehicle stop over the radio.
L - Location
C - Color of vehicle
Y - Year of vehicle
M - Make / Model of vehicle
B - Body style of vehicle (2-door, 4-door, SUV, et cetera.)
O - Occupants of the vehicle (how many, description)
L - License plate information.
The felony stop, this is a stop where you are already aware of the danger of a suspect, and are ready to arrest a suspect, this type of stop is preferably executed by more than one vehicle, but could be done alone if necessary.
This stop is done simply by ordering the vehicle to stop, and putting oneself in a tactically advantageous position such as slightly sideways, with the door open. You withdraw your firearm and order the occupant of the vehile to drop their vehicle keys out of the window, slowly and get out of the vehicle as they are to be ordered to approach the police vehicles backwards, where they are to kneel or lay down to be detained.
Additional vehicles to the lead vehicles always line up next to one to avoid crossfire.