

Likely a mixture of these answers, though if you want to wait for an expert to weigh in maybe ask for that. A roadway is obviously a very different environment with a lot of money and research put into ensuring it can handle a lot of traffic and weight, having to accommodate worst case scenarios so it’s obviously going to have a very strong base, and a comparitively very durable and thick base of asphalt. Your driveway, on the other hand, is probably going to be covered in a mixture very much driven by price. If you do the minimum underlayment and thickness, you’re probably going to need to give it every advantage possible to avoid rework.
From what I’ve seen, hail rarely harms the paint at all before the point where it will leave dents.