You could make a variety of wraps using tortillas. I like them for lunches with a bit of turkey or chicken, with green and red pepper strips, and whatever other fresh veggies I have. You could cut them in 3rds once they're ready, for easier eating. One of my faves is cottage cheese with fruit on top, but that could be tricky to eat on the road.
If you had a chance to pull over and eat, you could take a thermos of hot food, such as soup.
Don't forget a baggie full of grapes, strawberries, and other finger fruits. Another idea is a serving of dry cereal.
A big YAY for you, planning ahead!