Brownrodster,
In New England we bid Start Times, literally.
The Supplement also requires that a job or route description be listed next to the Start Time, but it's the Start Time you actually bid on.
There is no annual bid for part-timers, but they do have the right to bid on new jobs and job openings as they come up.
Backeruper,
The Supplement prohibits part-timers from driving, period, and from driving on-property (except in emergencies or while carwashing.) Thus there are no part-time shifters in my building. Except that, wait a minute, all shifting has always been done exclusively by part-timers since they built the building in 1972! In fact, I, myself, was a part-time shifter for years until my job was converted to an Article 22.3 in 2000! I now shift as a full-timer, though the other shifters are still part-time. (We only have one shifter working at a time though, as there is not a lot of shifting to be done.) Every Supplement is different, and some are best read by Rod Serling, with that disturbing Twilight Zone theme playing in the background.