On the subject of avoidance, oranges are near the top of my list. I love eating oranges, but on a drive and even pre-peeled, their stickiness requires a moistened towelette rather than just a napkin or piece of paper towel. The same is true for most cheesy chips, but especially Cheetos (which I otherwise love). Basically, anything that leaves behind residue that a swift finger licking or hand wiping cannot cure is something that I want to avoid--especially when driving.
Chocolate items find themselves in a sort of middle ground. A lot of my preference will depend on the temperature, the type of chocolate, and the amount of time that I would have to spend holding the chocolate while eating it. In general, the cooler the temperature, the darker the chocolate, and the fewer seconds that I have to hold it all make me happier when dealing with a chocolate snack.
Otherwise, my primary travel snacks include the following items. Number one are Pringles in their original, sour cream and onion, or ranch variations. Bugles in original or ranch are also quite nice. Some kind of not-too-tough jerky is good if I want something more substantial. Particularly for the purpose of staying awake, my go-to food is lightly-salted peanuts--I don't know why they work for me, but they do. As a special treat, I also like gummy-sorts of sweets. Baby carrots might make it on the list if I'm trying to pretend some semblance of healthy eating.
As I think about it, I'm going to need to stop by the store tomorrow.