1. A computer-readable storage medium whose contents include instructions that when executed configure a computing device to use predicted future traffic information for roads, by performing a method comprising: receiving information indicating current traffic conditions at a first time of each of multiple road segments of one or more roads; receiving information indicating other current conditions at the first time that affect traffic on the multiple road segments, the other current conditions including at least one of current weather conditions, current events that are scheduled to occur, and current schedules for school sessions; using the information indicating the current traffic conditions at the first time and the other current conditions at the first time to, for each of multiple distinct future times after the first time, predict future traffic conditions for the one or more roads at that future time, the predicting of the future traffic conditions for the one or more roads for the multiple distinct future times being performed by the configured computing device and including generating multiple decision trees that represent the future traffic conditions for the one or more roads for the multiple distinct future times, each of the multiple future times being represented by at least one of the generated decision trees; and providing information about the predicted future traffic conditions for at least one of the future times for use in facilitating travel on the one or more roads, the information about the predicted future traffic conditions for each of the at least one future times being obtained from the at least one generated decision tree that represents that future time.