Add bonuses to Pavement.
For example:
- Walking on Pavement adds a little speed.
- Running on Pavement adds a little speed and decrease Phlegm drain.
- Carrying objects on paved ground adds a little speed.
- Using Wander and forage on paved ground decrease Phlegm drain.
- Pulling sleds on pavement is faster.*
This would give people a reason to make roads.
Edit: Onionfighter*