Try to list ten objects before choosing a new color. If two or more kids are in the car, they can compete to see who gets ten objects first, or they can cooperate to get ten objects together, with an adult keeping score. Alphabet Hunt Watch out the window for road signs, billboards, store signs, etc. Number Hunt Watch out the window for number from 1-9, in order. This is a good game for long drives.
Children can cooperate or compete to see who can find all the items on the lists.
The lists can be made up ahead of time or during the drive, and adjusted for the type of scenery and the age of the children. Count if you can if not guess at how many are in the field. Keep track of each persons cow count. That person goes back down to zero. First person to see a church doubles their cows.