Abstract: Among other things, information is received from a user interacting with a user interface about a trip that is being planned from an origin to a destination, the information including a user indication of travel modes to be considered in planning the trip and the possible travel modes including at least three of bus, train, car, water, and air. Two or more alternative travel options are determined each including two or more of the modes based on the received information; and the options are presented to the user through the user interface.