You are approaching a vertical lift bridge.You know the span is fully open when（）.<br>A:Three white lights in a vertical line are lit<br>B:A red light starts to flash at about 60 times a minute<br>C:A yellow light is illuminated on the bridge pier<br>D:There is a range of green lights under the lift span

You are approaching a vertical lift bridge.You know the span is fully open when（）.
A:Three white lights in a vertical line are lit
B:A red light starts to flash at about 60 times a minute
C:A yellow light is illuminated on the bridge pier
D:There is a range of green lights under the lift span

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