You’re in your car waiting at a level crossing. The train has come and gone and the boom gates are on their way back up. When can you start moving again?
When the boom gates are completely up and the red flashing lights have stopped.
Drivers and pedestrian must not enter a crossing if warning lights (i.e. twin red lights) are flashing, or warning bells are ringing, or if the gate, boom or barrier is closed, closing or opening. This means you cannot enter a crossing after the boom gates have opened if the lights are still flashing or bells are ringing.