The D1 is still there theses sunday : https://www.mapillary.com/app/?pKey=26395822600044764

Looks like a typical Brussels situation : works on a regional road, change on nearest street signs but no change on the municipality side.

Maybe we can consider that there is no C1 sign and make the part near 154A bidirectional ? It's borderline i agree but i don't see another solution.

