The thing to keep in mind when building "on-the-go" quizzes is to make the location radius big enough, so that the device never misses it. 500 meters on a highway is a good bet.
You can also add location specfic questions or stories (look outside the window). Keep in mind, that on a highway with speeds around 90km/h, a bus covers 1km in 36 seconds. If the radius is 500 meters it gives 18 seconds or less from the time the question opens to the correct place.