Roads speed land unit movement. Land units moving along a road can move three times faster than normal. Enemy units may use roads you have built, and native units you control may use them to move more quickly outside of fungus.
Roads also increase mine production in rocky squares.
Terraform Variation (Modifiers are Additive): +1 Rolling, +2 Rocky, +1 River, +2 Fungus, +2 Forest.
Requires Centauri Empathy to be constructed on fungus.