They could have (a) been following you and/or casing out your home, or (b) they could have been lost and just following some tail lights up ahead (ever been really tired while driving on the highway--or an unfamiliar place really late at night?--I find I have a tendency to follow tail lights ahead of me.)
I've personally pulled in to peoples driveways to look at maps, and when the home owner opened their front door I would drive off.
Nonetheless, given the parameters of a high crime area, I'd make sure your wife carried, or, at the very least, remained in condition yellow. Did your wife pick up on the 'being followed' thing? I'm not sure about your wife, but I have a hard time convincing my fiance to remain wary (especially since I'm at the second most dangerous campus in the U.S.).
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