A1m no overtaking

Between the A690 Durham and A167 Chester-le Street northbound i’ve noticed they are putting signs up but keeping them covered up can anyone tell me if they are the no overtaking for HGV signs?

No north bound they are cheveron signs telling u to keep ya distance however south bound there is an overtaking restriction for 7.5t+ between 7am and 7pm. i think thats the times but thats the score any hoo