Searching this board for a lunch site off 99 did not give many suggestions. However, we pulled off 99 at the California exit in Bakersfield for gas, and right there was a Logan's Roadhuse (I guess it is a chain). My wife had a good burger and I had a grilled meatloaf with a nice mushroom, oniion gravy - choice of several sides. Side salad was good as well, fresh greens with goodies (olives, hearts of palm etc.)
Overall - pretty good for what we wanted as road food.