I notice way too many people are waaay to **** about this. Sure, knock down and get rid of the worst and of course BIG stones, but it's amazing how totally the gravel disappears when the grass grows. Can there really be that many people looking for something to do?
Every spring the concession road in front of my place is covered with tons and tons of gravel and sand. Looks like it will never be grass again! If it's badly damaged and rutted, I level it with a Harley Rake, but it always grows grass again, and you would never know. Besides, I figure, the agregate will give the grass shoulders a bit of resilience against vehicle traffic in wet conditions.