No it's not your fault! They should have written it out like normal people instead of using emojis or pictograms or what ever the fuck kids call it these days!
You're being sarcastic, right? There's no way in hell that a sign that says VERBODEN TOEGANG VOOR BROMMERS, SNORFIETSEN, EN MOPEDS is somehow more readily understandable than a pictogram that I could recognize from 20 meters away in a low-resolution photo
Specifically it's about the "milieu zone", this is a sign at the threshold of an urban area that is forbidden to older diesels, the vans with numbers next to them are diesel "classes", the oldest ones are now forbidden in most city centers.