I see the same situation at 400 north to highway 7 and 401 west to dixie, difference being there are 4 lanes, 2 per turn. I avoid being beside anything while turning with the expectation that most are going to mess it up.
Even when the ramps are paved with huge curves the trucks seem to take the lazy way, and trucks starting from the second right turn lane often end up in the third lane, even when they want to end up in the middle.
I bet some of these truckers are sticking to the middle of the lane instead of properly preparing for the turn because they know that if they are on the left line of such a wide lane some dingleberry is going to pretend there is another lane there and squeeze by them. Switching to no-right-on-red could help if that is the case.
Many people seem to be pretty horrible at planning ahead for what lane they want to be in for the next turn, in some american cities, you will find that the next interchange is signed one ramp in advance and they switch to solid lines between them, nice in theory but doesn't stop people from being in the wrong lane.
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