This report documents a modeling study performed as a follow-up to a qualitative online evaluation of the Traveler Advisory News Network (TANN) and SmarTraveler traffic information web sites (7,8) by researchers at the Volpe National Transportation Systems Center (9). The Volpe study found that users of these web sites perceived that they saved time and arrived on time more reliably as a result of accessing these web sites for real-time traffic information. As a follow-up to this qualitative study, the study presented in this paper uses an analytic approach using field data to empirically corroborate these findings.