I think that's the key Rathji- by the time the Trucks are near you they are already past one set of lights, so the truckers are into "city driving" mode. However in Copperfield I hear them all the time as my part of 22X is still un-lit highway and truckers haven't had a stop in dozens of kilometres.
I also think that once it's an expressway without traffic lights there will be less need for them to brake.
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