Here is what I believe I read, or something close to it.
"When reporting for work each day, there will be 8 hours per day, for a 40 hour week providing work is available" Again, something along those lines.
Scenerio:
A high seniority driver cones into work 1 day and is told "Your route only has 7 hours of work, that is all that is available for your route today"
BUT, the lower seniority driver right next to him (or her) has 8.5 hours scheduled for their route.
The high seniority driver gets less hours that day than the less senior driver?