How your seniority system works can be negotiated terminal-by-terminal in the form or a supplemental or through your dispatch rules.
We have two types of seniority boards at Oak Harbor Freight: split board (Where I am this is the way it is, but it's in the minority) and the common board.
Split boards work well in bigger terminals, I feel; and common boards work well in smaller terminals.
I personally prefer split boards, because I hired on as a line driver, and have no interest in driving in the city. Been there, done that, don't care to do it anymore. We have a very small percentage of city drivers at the terminal I work out of who are agitating for a common board, but they want it so they can jump to the line in the summer when the weather is good and they can run the miles, and when the snow starts flying, they can jump back into the city and stay out of harm's way.
My point here is that whatever you do, do it, but don't go changing things in mid-stream. because that will cause heartache and strife to no end.
I hired onto my line board and sweated and starved the first couple of years, because when work was thin and I was on the bottom, I had no right to work outside of my classification. So a senior city driver who never had to miss work because he always got his forty hours a week either in the city or on the dock is now going to bump me down by sliding in ahead of me.
So... where was his sacrifice? He didn't have to sit at home even when he was on the bottom like I did, but now he's going to get the gravy simply by right of company seniority? I paid my dues to get to where I'm at, is my point.
And there is nothing I hate worse than a fair-weather driver...