Austin/San Antonio Origin-Destination Study: Volume I: Summary Report (1186-2)

This research report summarizes the results of a study directed at developing estimates of current and design year traffic that might divert from I-35 between Austin and San Antonio to an alternate route in the corridor. The general location of the alternate route was defined by the Texas State Department of Highways and Public Transportation. The results of an origin-destination survey conducted to identify current travel patterns in the study corridor, and the use of this survey data to estimate the diversion potentials of the alternate route are summarized. A companion report (Vol . II) presents additional summaries and describes the data analysis phases of the study in greater detail. The results of the study indicates that, if the proposed alternate route were in-place today, approximately 7300 vehicles per day would divert to the new facility at its maximum load-point. This estimate of diverted traffic represents approximately 20% of the current ADT on I-35 between Austin and San Antonio. The corresponding design year (year 2006) projections indicate that approximately 11,000 (low estimate) to 18,000 (high estimate) vehicles per day would divert to the alternate route.