We have it in black in white in our supplement:
Voluntary time off will be offered in seniority order in each center.
In addition all senior drivers, including cover drivers, are guaranteed 8 hours of work as long as they report by their scheduled start time. You can't be "sent home" unless you agree to it (that's why its called voluntary time off). That's never really an issue though, because it's a rare day that no senior drivers want to take a day off.
Voluntary time off will be offered in seniority order in each center.
In addition all senior drivers, including cover drivers, are guaranteed 8 hours of work as long as they report by their scheduled start time. You can't be "sent home" unless you agree to it (that's why its called voluntary time off). That's never really an issue though, because it's a rare day that no senior drivers want to take a day off.