Florida's biggest industry is tourism; the state also has sizable agricultural development and phosphate mining operations. The climate is mild but wet, making roads easy to travel. Florida freight rates tend to change with the seasons, as the tourist industry requires a large volume of goods to be shipped into the state year round. The summer citrus season can drive Florida freight prices up significantly. LTL freight shipping is usually very affordable due to the volume of goods moving through the state by truck and rail. Florida does not border any other countries, but there is a very busy international port that also helps drive the price and volume of freight through the state.