I'm pretty sure they do now have a posted limit. flyer your right they're are many to blame And I'm in no way the worlds best driver. Here we don't get a lot of motorcyclist, I mean we do but 4-5 months a year? I get paid buy the hour the customer gets charged weather it takes me 3 hours our 15 min to get there. Truckers are trying to put as many miles behind them in an 8 hour time frame. I travel i90 a lot and a large part of it is two lanes. one of the BIGGEST problems is trucker A is following trucker B, A is going 66mph, B is going 65mph. A wants to pass B and he doesn't give a fuck that there is a line of cars in the fast lane doing 70mph plus (speed limit is 70 here) A flips on his directional and cuts off traffic in the fast lane taking 4 miles to pass trucker B. This happens hourly!!!! I'm bigger than you get the fuck out my way, it drives me insane! another thing that happens here in blizzards is two semis will be following each other, the first semi will go in the ditch and the stupid SOB behind him will follow him right in