What is the government's argument that the police had cause to stop a pickup truck because of a reasonable suspicion of gang activity?

The Government argues that the police had cause to stop the pickup based on two observed traffic violations and a reasonable suspicion of gang activities. The Government rationalizes the stop under Arizona traffic laws for (a) a speed violation, see Arizona Revised Statutes 28-701.02 (speed limit law); Slavin v. City of Tucson, 17 Ariz.App. 16, 495 P.2d 141, 144 (1972) (excess speed infraction depends on maximum speed limit and on actual and potential hazards), and (b) unsafe movement in violation of Arizona Revised Statutes 28-721, 723, 725. ⁴

The Government also argues that the officers had reasonable suspicion to suspect that a crime may have been committed or was about to be committed. See United States v. Cortez, 449 U.S. 411, 417, 101 S.Ct. 690, 694-95, 66 L.Ed.2d 621 (1981). The Government contends that viewed as a whole, the circumstances indicate that criminal activity was imminent.