The sole purpose of the Caravan, a collection of freight vehicles, is to conduct <l:6,58>trade<e> by transporting <l:6,94>goods<e> along <l:6,59>trade routes<e>. Caravans never require orders and never appear on the map. Caravans do not have to be built in the city operating the trade route. One Caravan can support one trade route, while one city can support four incoming and four outgoing trade routes.