The shooter usually uses a wooded area for cover .. they should be staking out these areas if they can
Whole lotta wooded area from Maryland to southern Virginia. Even if you took care only to post people in sections off major highways, there probably aren't enough cops in the region to do such a thing. Besides, if you staked out THIS type of area or THAT type of area, the shooter would just change his MO. Sitting around waiting for the guy and hoping that you've anticipated where, in his very broad range, he'll hit next is a useless reactive tactic, IMO.