Dragging with the mouse wheel  displays the following train's headway curve that can be moved horizontally by dragging.

Additional red and yellow two curves are also displayed.

The red curve indicates the position where the following train can stop

The yellow curve indicates the position where the following train can decelerate to the caution speed limit. This curve is not displayed while the train runs under the yellow signal speed limit.

When the yellow curve crosses the yellow signal zone, the signal is displayed  in red to alert.

When the preceding is passed by the following

This is the warning example when the preceding train is passed by the following train at the stopping station.

Green arrowed areas are warning areas exceeding signal limits.

Two train's current interval time is displayed at the right bottom corner of the graph.

Until the preceding train runs ahead of the following train, the warning is displayed like this.

After the preceding train is passed by the following train at the station, the warning is displayed like this.

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