Alters everyone’s movement speed based on the type of terrain you are on. From -25% for snow up to +35% for Asphalt. It also affects zombies and Elucidus think it still doesn’t work for vehicles.
The forum topic of the mod is here.
Credits: Elucidus
Terrain Based Movement Speed
Update the mod until 19.6 Alpha, it is no longer supported by movement in the snow and I will be happy to update, then your mod is very good !!