Rank the freight modes (dry van, reefer, flatbed, intermodal, rail, barge, dump truck) for a shipment between two U.S. places, with the reasons for each, and return the lane distance in miles. Use it first when you only have city names or ZIPs, then pass the distance to an estimate_* tool for a price. International lanes return the ocean/air routing instead. Does not count toward the estimate allowance.