If you have some sleepy passengers in the car, you should definitely play “While You Were Sleeping.”
Road Trip Activities: Traveling with Kids - The Idea Room
Free Printable Battleship Game | Bye-Bye Boredom! Free Print & Play Car Games
I've got a boy who would love to work on this in the car!
Print & Go: Free Travel Games for Family Road Trips: Road Trip I Spy
Huge collection of car games and road trip ideas for kids
License Plate printable for long trips with the kids!
100+ Activities to keep kids busy this summer
Road Trip Activities for Kids Ages 2-8 ~ Stuff for Kids to Do on Long Car Rides | The Measured Mom