I'm not sure if anyone has thought about this before, but early in that game, I think it would be nice to have simple dirt roads (tire tracks with flashing beacons to keep drivers from getting lost). The vehicles on these roads would be jeeps, buggies, and trucks, probably with solar panels for power. Also, why build bridges on a planet that has no liquid water? I can imagine there being a need to bridge over chasms, but thos would look different than the ones I've seen here. Just some ideas, keep up the good work