Walden Street near Concord Town Courthouse
After the courthouse, the speedlimit drops to 20 (Right before the police station, surprise!). They will either sit in the courthouse road, or right in the police station lot. Also, if it is late at night or mid day they will usually follow you; as there are a multitude of 4 way stops in this area. Be sure you stop completely at all these signs, or you will find yourself pulled over.