[munk-a]

Qualification: I can't really confirm this fiscal responsibility of this.

Vermont is of the opinion that resurfacing roads frequently (like every two years) is cheaper than investing in anti-frost heavy road beds and cement... The reasoning behind this is that intense ground freezing can end up upsetting the best bedding techniques and causing frost heaves anyway - that coupled with frequent ploughing to deal with heavy snow fall makes long term road investments fiscally irresponsible. Also the state has frequent flooding issues which can upset road bedding in more different and fun manners.

[LegitShady]

depending on how plastic the soil, replacing it with the road base doesn't stop deformation just slows it down. If the base material is heavier than the native material it will speed the whole thing up.

Then you get into the territory of lightweight fills and it gets really expensive very quickly even beyond basic roadbuilding.