NORTH FORSYTH — Motorists traveling along Ga. 400 near Martin Road in north Forsyth have reported seeing a large number of sheriff’s vehicles and law enforcement activity this week. But according to Robin Regan, a spokesman for the Forsyth County Sheriff’s Office, there’s no cause for alarm. Regan said officers are conducting training in the area and those exercises will continue Wednesday and Thursday. Another large training exercise is scheduled for Friday in south Forsyth.