1. A computer-implemented method for providing information related to vehicle travel on roads, the method comprising: for each of one or more roads, obtaining a plurality of data samples of one or more types that reflect travel characteristics of vehicles traveling on the road during a period of time, the obtained data samples including multiple mobile data source data samples that are reported by one or more mobile devices moving along the road; automatically assessing, by one or more programmed computing systems, the obtained data samples to identify a group of multiple data samples to represent actual vehicle travel on the road during the period of time, the identifying of the group including excluding any data samples that are identified as being unrepresentative of actual vehicle travel on the road; automatically analyzing, by the one or more programmed computing systems, the identified group of multiple data samples to determine one or more estimated measurements of actual traffic flow during the period of time on the road; and providing one or more indications of the determined estimated actual traffic flow measurements for use in facilitating travel on the road.