Originally Posted by OldRightHander
Well, to a certain degree I do feel that a signal does entitle me to a lane change. I will be patient for a while, but if after a good amount of time I've had my signal on and nobody is acknowledging that I even exist, then I might be tempted to try to force my way over. If I need in that lane, it's usually for a good reason and I'm sick and tired of people who will do anything possible to keep me from coming over because my vehicle is taller and they don't want to be behind me.
A signal only entitles you to change lanes if it is safe. If you are driving professionally then I would expect you to know where you are going and to do so in a safe manner. In California trucks can only travel in the right two lanes (with minor exceptions) on the freeway so it's not too tough to figure out where you should be if you are going to 'need' a lane. I expect you to plan ahead and then you won't 'need' that lane, you'll be in it.