I guess it would depend on the size of the facility. At the large DCs, a trailer may get moved from a dock to the line of parked trailers 1/4 mile away. Eight times per hour would equal two miles.
It would have to be a pretty large place to get any miles in if anyone even keeps tracks spotters mileage. For P&D a 10 year safety award is equivalent to a million miles, I'd imagine it is similar for spotters.
Local drivers that stay around their area, usually within 100 mile radius of a terminal, picking up and delivering loads.
LTL (Less Than Truckload) carriers for instance will have Linehaul drivers and P&D drivers. The P&D drivers will deliver loads locally from the terminal and pick up loads returning to the terminal. Linehaul drivers will then run truckloads from terminal to terminal.
I know a yard driver with 3 million safe miles. I asked him about his stickers. He spent decades on the road before becoming a yard dog. He's been around so long that he has a dedicated yard tractor.
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So I'm currently sitting waiting to get unloaded at Ball Metal in Middletown NY. Currently there are 5 Dry Vans waiting to get loaded and in front of me is my Mentor waiting to unload his 5 coils, me and two more from our company waiting to unload. The yard dog at this facility has a "Million Miler" decal placed on the driver's cab. I'm assuming that the operator had some OTR time and acculturated most the miles along that path. But I got me thinking how many years would it take to rack up a million miles if you were only driving a yard dog? At a large DC Like WalMart or Target I can see racking up the millage if you were working 8 - 11 hour shifts; but this facility is small in comparison. Could you rack up million in less than 20 years by just driving a yard dod?
OTR:
Over The Road
OTR driving normally means you'll be hauling freight to various customers throughout your company's hauling region. It often entails being gone from home for two to three weeks at a time.
Dry Van:
A trailer or truck that that requires no special attention, such as refrigeration, that hauls regular palletted, boxed, or floor-loaded freight. The most common type of trailer in trucking.