In an exemplary method, a mobile device provides mobile device attribute data to a traffic monitoring subsystem, receives traffic condition data generated by the traffic monitoring subsystem based at least in part on the mobile device attribute data, and presents, by way of a user interface displayed on a display screen of the mobile device, the traffic condition data for consideration by a user of the mobile device. In certain embodiments, the presented traffic condition data includes at least one of an indication of a number of mobile devices that provided attribute data used by the traffic monitoring subsystem to generate the traffic condition data and an indication of a confidence factor for the traffic condition data.