Most drivers sit in the cab while warehouse workers do the load and unload work.
Right now, that counts as on duty not driving time, even though the driver is sitting in the cab or the warehouse driver lounge if there is one.
Then, they have mandated breaks where more often that not, they just sped=nd it sitting in the cab. While it sounds unfair, it’s actually a benefit for them and may serve to get them home faster and/or decrease delivery time.
I’ve seen drivers pull out from the dock and go park the truck in the same lot to take their mandatory break because even though they’d been sitting or sleeping, the clock said it’s break time and they are legally required to stop.