After just recently moving up here, first thing I did was decide to..scope out the "competition" so to speak . I've learned that both the local PD and the local NCSHP post have tons of UNMARKED units patrolling the area. Everything from your typical unmarked crown vic to the NCSHP using unmarked mustangs/SUVs/pick up trucks.
Some run radar some don't but if you plan on coming into Shelby, keep your eyes peeled and your RD on 8) . There is one spot the local PD likes to sit at, notice them using a marked vehicle during the day and at night they use an unmarked vehicle in the same spot. It's on Hwy 74 Westbound before the Super Wal-mart and a PSL from 55 to 45. Google earth picture below. I placed an "assumed" target area just because I don't see how he could ID a speeding vehicle beyond that point due to line of site issues.