Hello and welcome to OSM.

Thanks for adjusting the speed limit.  Indeed, the Brussels Region is now gradually phasing out the exception regime for boulevards that kept a 50 km/h limit after January 2021.  Looks like we failed to notice this one.

Just one thing: tags in OSM are usually nested, so if we say "maxspeed=50" we usually put an additional tag stating where this limit comes from, and we use the "source:maxspeed" tag.  If you use the online editor, you can see that in the list of tags at the bottom of the editing window.

For this case, since 50 km/h is not the official speed limit in the Brussels Region, maxspeed=50 was associated with having C43 road signs everywhere.  We map this as "maxspeed=50" + "source:maxspeed=sign".

If the authorities remove the road signs, the new speed limit becomes "maxspeed=30" indeed, but we also adjust the other tag, which becomes "source:maxspeed=BE-BRU:urban".  This is a standard tag to confirm that the speed regime here applies the default value.

I understand this is a very technical explanation.  Don’t worry, I’ve already cleaned this up and fixed the tags on all the roads you have been editing.  Don’t let this intimidate you, we are all learning every day.

Happy mapping.