baffle gate bags closed control covered entrance exit faregate gate gates hooded hoods mass transit stations mass transit turnstiles movement control not used one-way people traffic passenger control passenger movement passengers pedestrian control railway station sealed signs turnstile turnstiles waist-high turnstiles car instrument instrument panel macro petrol station architecture bridge flow forest Great Britain green hills lake management reservoir spring station stone tower wales water welsh alternative energy renewable enregy control station energy field AC/DC enery power. electric power solar solar enery clouds communication hill mast microwave network radio transmitter brooding