https://social.overheid.nl/directory has a list of government services, municipalities, and other stuff.

https://social.overheid.nl/@RWSverkeersinfo is for traffic conditions

https://social.overheid.nl/@knmi is the royal national weather service

Some services have shut down their Mastodon presence because their social media team found too little interaction and they don't want to use simple forward bots that nobody responds to, unfortunately.