Dh used to drive a lot a few years ago. Basically he ate food that he could eat whilst driving. So he really like cold meats, roasts, sausages etc in smaller pieces with salad, maybe something for dipping like a creamy salad dressing with some cheese squares Hard boiled eggs, the odd protein bar. Quiche cut up in small pieces worked well as well, just be creative with ingredients. Just remembered rather than cutting up, just make small ones without pastry in muffin pans, then freeze.