Which one would be true?

Bayangin ngerinyaa.. RT @GNFI: ITB ciptakan sistem lampu jln yg bs mati secara otomatis stlah jalanan tdk dilalui mobil. about an hour ago
ITB menciptakan sistem lampu jalan yang bisa mati secara otomatis setelah jalanan tidak dilalui mobil. Bayangkan hematnya! about an hour ago

Well, I could not grasp or decide which one of the above opinions does ...really-really... explain the seemingly intriguing invention. Should it be really useful or rather... would it be harmful?