Perfect stop on LA to Vegas drive: Barstow station. There's McDonald's, subway, panda express, dunkin donuts and loads more inside. In the same parking area there's a Popeye's. The McDonald's is clean, easy to access off the Main Street exit from the 15, and usually quick using the drive thru. They've got 2 clerks operating 2 lanes for the drive thru. Across the street, you'll find a Travelodge if you need to crash, Starbucks, and loads of gas stations. On the 4+ hrs to/from LA/Vegas, I prefer Barstow Station over Baker, because there are way more options, the prices are more normal. Baker has a more tourist trap feel to it.
Great staff that are patient and take the time with your orders. Nice touch bringing the food to your table when ready. Bathrooms need cleaning though.
This Panda Express is great. I've never had Panda as roadtrip food before, but it was really good. There was this god awful couple in front of me continuously whining and shouting insults at the workers because the line was "long" (it really wasn't all that long). The workers maintained their composure and gave these people their names when they asked so they could complain about them. I would go here again!