National Highways Authority Of India [NHAI] — heavy vehicles (trucks) block all lanes on mumbai pune expressway

There is several boards on mumbai pune expressway saying that heavy vehicles should stay to the left. Still, around nighttime, heavy vehicles (Trucks) block all 3 lanes on the expressway. I travelled twice on the expressway from mumbai to pune around nighttime. One time it showed me a slowdown of 52 min. 2nd time also it was around the same slowdown. Please do something about this. Thanks!