What does this sign mean?

• 40 km/h is the lowest maximum speed limit in the area when the light is flashing.
• The flashing light indicates the oncoming of a train at the railway crossing ahead.
• The speed limit in the area remains in effect even when the lights are not flashing.
• There is a speed limit in the area ahead when the lights are flashing.
  Explanation:

  "This sign indicates that the speed limit in the upcoming area (mentioned on the sign) is enforced only when the lights are flashing. Drivers must reduce their speed to the specified limit during these times to comply with traffic regulations."