In exchange for Nokia N95's and $250, 100 University of California at Berkeley students have signed themselves up to become part of a human sensor network experiment for modeling Bay Area traffic. According to project research director Alexandre Bayen, the Mobile Century experiment is "applying data assimilation algorithms to traffic flow models (hyperbolic first order conservation laws) to integrate measurements from cellular phones into the estimation of the velocity field on the highway. Applications include travel time prediction, estimation of traffic density and congestion and ramp metering."