"I Spy" is a classic car game that many people played on family road trips when they were young, and it helps children develop observational skills.
Find a fixed object that everyone in the vehicle can see and say, "I spy with my little eye something that is …" Then give a clue as to what the object is.
Everyone else in the car takes turns asking yes or no questions about the mystery object and guesses. This pattern repeats until someone guesses the right item. That person then gets to choose next, and the game continues.
To give everyone a fair chance, rotate the order in which people guess.