Tunnels/Bridges

Tunnels and bridges can be built by using the green or red arrows in the top right corner while using the road tools. Bridges can go over power lines, roads on the ground, and other bridges. Tunnels can go under buildings. Tunnels cost diamonds though, but you can reduce the cost of them by using the "Half Tunnel Price" booster, which is found by the green plus on the top right of your screen.