There is a difficult to see 'no left turn' sign on Route 9 in Ri

Rio Grande - There is a difficult to see 'no left turn' sign on Route 9 in Rio Grande immediately south of the Route 47 intersection. Does it mean no left turn, or has it just been installed for decoration? Why is no one ever ticketed for turning left there? Disregarding the sign is a daily practice and cars making the turn continually block traffic headed south on Route 9.