Set in the direction of ETC toll lanes on the canopy greet car, you can display the letters "ETC", cross (denoted by X) and down arrow (indicated by ↓) three graphics. Letters: "ETC" When light is green, which means that this is not no parking lane driveway, the normal state, allowing the vehicle to install the device by OBU; cross (indicated by X) when the light is red, it means lane closed to traffic; to Down arrow reserved.