All former roads between adventure sites has been overgrown over the years of the Blood Mist due to lack of being used. Roads can exist within an adventure site because they could have been used during the Blood Mist. Roads tolls are usually charged at the border of a village or at bridges and that can still be done. Roads between settlements are usually made over time, naturally, something that probably is beyond the campaign.
“I’d say thistles, but nobody listens to me, anyway.” - Eeyore