So even if you own 4 cars - like a lot of us, maybe have a weekend toy and a project car - and the child bona fide only drives one of the other two normal DDs on occasion, and never those two extra - you still classify them as a primary on one? Even though that's not true? Seems like BS to me.
I mean, I can understand how one might assume that if there are 4 cars in a house and 3 people with licenses, one would assume that's 3 cars being driven as primary vehicles... but I'd think there should be some way to adjust for reality.
I classify the young driver as a primary on one of the lower value cars. Regardless of the story.
Vehicles in the computer are classed as Work or School, Pleasure, Business, Farm, Other...
If a couple has 4 cars. 2 newer cars with loans and full coverage, and 2 older cars/toys with liability only. I always list the older vehicles as the primary (Work), the newer vehicles as pleasure. It does make a difference on the price. As for young drivers. It is really tricky. Every case is different and I usually float them around the vehicles until I get the lowest possible price for the customer.
To answer your question though...
If you own 4 vehicles, and the child ONLY drives 1 of them... You're price still goes up on every vehicle on the policy because of the added statistical risk, but it goes up the most (by a percentage) on the vehicle the kid is listed as the driver on.
There arent tons of loopholes and ways around every little thing, but there are some, tons of discounts for teens, good student discount, etc... Mostly stuff that doesn't get asked/offered by most agencts because the higher the premium, the more commission they make... but realistically. If you have a policy with 2 brand new BMW's it is going to cost you much more to add that kid than if you have 2 Brand new BMW's and a 87 Chevy Truck. Lol.
I can't speak for every company though. Only Allstate.