The iMessage Sticker app offers the images for every traffic sign commonly used in The Netherlands. Most traffic signs are the same or very similar for other European countries.
The sticker collection is also part of the Verkeersles app version 5.0.0 for iOS 14+. The Verkeersles app is offering information about the traffic law, rules and regulations, traffic signs and offers exams for persons studying for the drivers exam.
How-to delete the app: https://trafficsigns.nl19.com/delete-stickers-app/