I use my overhead lights, and fix the spotlight on the driver side mirror, if there isn't one the the center mirror. As collim 1 indicated, I waste no time getting up there.
I virtually always go to the rear of my cruiser and make a passenger side approach for several reasons which I have got to test with simunitions.
1. You do not expose yourself to traffic on the roadway.
2. You will not silhouette yourself.
3. They will not know where you are, or when you will make contact. Even in the daylight, often enough I have to knock on the passenger door to let them know I am there.
4. If things do go south, you have cover/concealment, and mobility on your side. At least with sims, seemed to work well even if the driver bailed and began shooting.
*shoe polish is cheap*
Quando Omni Flunkus Moritati