Bedding important. If solid concrete, for example, much better. Gravel underlayment for asphalt not as long life. Sealing after first cure period very important to asphalt longevity. Dont blow first sealing if you want it to last. Periodic sealing and regular patchwork thereafter based on traffic wear very important if you want to maintain smooth roads. Never seen proper sealing done here on the road, but I don't work in infrastructure here. What do I know compared to the geniuses running things here.