Highway

Highway
A highway is a paved and well-maintained version of a Road. You may upgrade a Road into a Highway. You must have a kingdom of Size 26 or greater to build a Highway.
Terrain: Any hex with a Road.
Effect: Economy +1 for every 4 hexes of Highway, Stability +1 for every 8 hexes of Highway; improves overland travel speed. These stack on top of the bonuses for the road previously.
Cost: Twice the cost of a Road (see the Terrain and Terrain Improvements table).