Is a traffic stop justified when an officer observes a vehicle failing to stop at a stop sign?

Generally, a traffic stop is justified when an officer observes a vehicle fail to stop at a stop sign (see Vehicle and Traffic Law 1172 [a] ; People v. Davis, 32 A.D.3d 445, 445, 821 N.Y.S.2d 217 [2d Dept.2006], lv. denied 7 N.Y.3d 924, 827 N.Y.S.2d 693, 860 N.E.2d 995 [2006] ). However, the parties here are in agreement that the stop sign at issue was not legally valid because it was not properly registered as required by Vehicle and Traffic Law 1100(b). Thus, the People concede that defendant could not be prosecuted for a stop sign violation. Nevertheless,