What does this sign mean?

• It indicates the drawbridge is always open for road traffic.
• It indicates that the drawbridge may be raised or lowered, and the signals indicate when to stop.
  Explanation:

  "There is a drawbridge ahead. Drivers must act accordingly to the light flashing. ► Red. Come to a complete stop at the marked stop line. The bridge is in operation and the roadway is closed to all pedestrian and motor vehicle traffic. ► Yellow. The light is about to turn red. Stop if you can safely do so. The bridge is about to start operation. ► Green. Proceed with caution."
• It indicates that there is a toll booth ahead.
• It indicates the presence of two lanes for traffic on the drawbridge.