They tend to travel in groups. You will often see 2-5 together at any point of time. The number depends on who is being transported! 

Yes l know. 
I didnt realize there were so many black suvs out. 
I didnt see them when l was visiting dc. 

Satosora

So the high-ranking Members of Congress and the Admin who have protective details are driven in black SUVs. It is what the Secret Service uses for their details so there are a ton of them in DC and especially around the Capitol.

mostly_harmless

Navigating Life When You Are Young With Chronic Illnesses Part Six

Cje95

So the high-ranking Members of Congress and the Admin who have protective details are driven in black SUVs. It is what the Secret Service uses for their details so there are a ton of them in DC and especially around the Capitol. 