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. II) presents additional summaries and describes the data analysis phases of the study in greater detail. 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 diver- sion potentials of the alternate route are summarized. The general location of the route was defined by the Texas State Department of Highways and Public Transportation. Abstract 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. Research Study Title: Origin-Destination Study Concepts: Austin/San Antonio 16. Supplementary Notes Research on this priject is funded by the State of Texas. Sponsoring Agency Code Austin, Texas 78763 15. Sponsoring Agency Name and Address Interim: September 1986 Texas State Department of Highways and Public April 1988 I Transportation: Transportation Planning Division P. Texas Transportation Institute The Texas A&M University System 11. Performing Organization Name and Address 10. -11- 5._ - :R:-ep-o-rt-=0-at-e - AUS tin/San Antonio Origin-Destination Study April 1988 Volume I: Summary Report 6.Field investigations may also provide additional information that is not readily accessible within the records on file for the location being studied.TECHNICAL REPORT STANDARD TITLE PAGE 1. In fact, a field investigation is often the most informative aspect of the traffic study and can help identify changes which have occurred over time. Merely observing traffic and street geometry can be insightful. Many times, more than one field investigation may be necessary depending on the nature of the request. When a complaint is received, a field investigation is necessary to verify problems and help the investigator search for treatments. The only time a field investigation may not be necessary is for maintenance items such as traffic sign replacements. Field InvestigationĪ field investigation is completed on nearly every request received for new traffic control devices. It is these trends that investigators search for and use to evaluate and recommend corrective treatments. Accident problems will likely be revealed by abnormal trends in the accident history. In this case, a review of accident records for the location in question will occur. aid in the planning process for the development of future projects.Ī concern for traffic safety and/or a complaint concerning reoccurring accidents at a particular facility may be cited as reasons to make changes.determine the effectiveness of corrective treatments in order to compare before and after accident occurrences, and.evaluate alternative corrective treatments,.The objectives in performing accident analyses are to: Since traffic signals are timed according to the volume of traffic performing each movement, these counts provide the engineer with the information needed to optimize the timing of the traffic signal. This helps identify the predominant and minor traffic patterns at intersections and helps determine the proper timing for the traffic signal under existing traffic conditions. Turning movement counts are traffic counts taken at intersections which provide the volume of traffic by vehicle movement. This is called collecting raw data, which can be analyzed to indicate the volume of traffic traveling the street, the vehicle speeds, type of vehicle and time gaps in traffic. The counter records the exact time of each axle hit. When a vehicle’s axle passes over the hoses, a pulse of air is sent to an air switch in the counter. Like San Antonio, most municipalities collect traffic counts using battery-powered traffic counters with road tube sensors, which are connected to a traffic counter. A traffic study typically involves collecting Traffic Counts, an Accident Investigation, and a Field Investigation. They are valuable for many reasons: they provide historical information about a location, they aid engineers when planning improvements, and they help identify problems and their level of severity. Traffic studies involve the collection and analysis of traffic data to aid engineers in their decision-making and planning processes.
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