It's like when a lane closes and people that merge in near the end get blocked for "trying to get ahead". But the road is closed there, not a kilometre before. They closed it there to maximise multiple lanes as long as possible to limit the bottleneck caused by the lane closure—use it so everyone can get through quicker. It must be painful to see for the people that set it up. Whatever the situation, traffic go faster when maximising available space and lanes.