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Die im Post angegebene URL zeigt auf ein anderes Bild als das Vorschaubild mit dem Ballonverbot. Es handelt sich um einen Wegweiser “Zu den Gleisen / 2 min”, unter dem jemand handschriftlich ergänzt hat “5 mit Gepäck”, dann “8 with baby” und (fast) zuletzt “10 min bekifft”.
In Germany and Austria, there was a tax on salt for cooking until recently (1993 and 1995, respectively). To avoid that people buy the cheap road salt and use it for cooking, such a bitter component was actually added, usually magnesium chloride (sometimes also capsaicin).
Many German sources still say you shouldn’t eat road salt for that reason, so maybe this is still done (though it is of course possible, that those sources are just outdated).