I'm not sure which way I would file this. More than one possible grievance
I will refer this question to
@Bubblehead
Or
@BigUnionGuy
Ok, here's my two cents worth.
While this scenario certainly qualifies as failing to treat both drivers, route and shuttle, with dignity and respect, making it an Article 37 grievance, I believe I would approach it as an HR/LP complaint instead.
In the past, I used the 800#, aka "help line" or "ethics hotline", but got little satisfaction, as the "investigation" always seemed to get kicked back to the minions in my area, who immediately circled the wagons to protect the guilty.
Lately, I have found it very effective to use the directory feature on the UPSer's site to climb the "report to chain", which lists everyone between the management person in question all the way up to the CEO, complete with email addresses and phone numbers.
I had a similar situation recently, where my center manager and OnCar were falsifying delivery records and shaving time cards.
After a series of emails and phone calls, an investigation ensued.
The result is that my center manager is no longer with the firm and the formerly adversarial OnCar is nothing but cordial, after a two week hiatus explainded away as being on "special assignment" (aka suspended).
Bottom line is that OP's scenario reeks of dishonesty and is being done to provide false data for mandated managerial metrics, the basis for their bonuses and stock options.
Knock on a door high enough up the food chain and someone will be interested.