Cars tend to be the 'ass' in assume with regards to truck. I say that because cars tend to expect trucks to accelerate, decelerate, and react at the same speed all the time. Well, there's one big problem, and that big problem is mass. If you see a 53' truck on the road or a 40' truck on the road, it could have 5-10,000 lbs cargo (empty container) or 60,000 pounds of cargo. Most of the time when that dragass truck is accelerating slowly at a light, its not because they're milking their working hours, its because the petal is on the floor and the thing is having a hard time moving. This, unfortunately, applies when stopping as well.
There's no easy way to tell where on the weight gradient a truck falls from an onlooker's point of view. I think this is why we have so many accidents around them. If there were more advanced turn/brake signals, like varying light intensity for brake pressure or something, maybe it'd help, but the critical mass required for such a change is almost impossible to acheive.
Disclaimer: I am not a professional driver, but I work in the transportation industry, so I've seen their struggles.