After these two posts:

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I thought that device deserved a category all its own but that only one icon did not represent it enough. I had joked about talking about a gif, but there is something similar that could work:

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It explains how the thing works, but not how to create it with certain functions...... I had thought about modifying an old ari_anim_policeman.zip file by Arimi, but here it is not just a question of replacing some icons. It must appear only for that category and not even for exceeding the speed limit, and create appropriate commands via .ui, .css, and .lua files........This is really complicated........

But the road is that and I hope someone can follow it.