Download or read book Analysis of Travel Time Reliability on Indiana Interstates written by Maria Martchouk and published by . This book was released on 2009 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Travel Time Reliability in Indiana written by Maria Martchouk and published by . This book was released on 2010-05-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods to Analyze and Predict Interstate Travel Time Reliability written by Xiaoxiao Zhang and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Moving Ahead for Progress in the 21st Century Act (MAP-21) defined requirements for system reliability performance measures. Under MAP-21, state departments of transportation are responsible for reporting travel time reliability and for setting targets and showing progress toward those targets. In order to know how to improve travel time reliability and what to expect from investments in transportation infrastructure, these agencies need a better understanding of the factors that affect travel time reliability and methods to predict future travel time reliability. The purpose of this study was to quantify the factors influencing travel time reliability and investigate how to account for these factors in setting reliability targets and communicating progress. To achieve these objectives, this study developed models to estimate quantiles (the 50th, 80th, and 90th) of travel time distributions to quantify the effects of travel time reliability impact factors and predict select reliability measures. First, linear quantile mixed models (LQMMs) were built using both data maintained by the Virginia Department of Transportation (VDOT) and crowdsourced event data. Model results using the crowdsourced data were unstable and difficult to interpret because of data quality issues such as unbalanced spatial density, duplicate reporting, and inconsistent event classification because of individual observer bias. The results using VDOT-maintained data were more reliable and interpretable. Those models showed that frequencies of non-recurrent events, such as incidents and weather, were correlated with higher travel time percentiles. The LQMM was compared with the trend line approach, a common prediction method used in practice, and the results showed that LQMMs significantly improved the accuracy of predictions over the trend line approach based on mean absolute percent error. Generalized random forest (GRF) models were also tested as an alternative prediction method. GRF models improved the prediction accuracy over LQMMs for the 50th and 80th percentiles, but the accuracy was slightly worse for the 90th percentile. In addition, the GRF models could also reflect the impact of variables that were removed from LQMMs because of insignificance, such as the presence of safety service patrols. Before-after studies were conducted to illustrate the application of LQMMs and GRF models. LQMMs captured the changes in the 90th percentile travel times better, and GRF models captured the changes of level of travel time reliability better in most cases. GRF models were more sensitive to the reliability changes caused by non-recurrent events, such as incidents or work zones, and could reflect the impact of variables that were removed from LQMMs because of insignificance. The study recommends that VDOT use the GRF model for predicting travel time reliability on interstate highways. In addition, further research is recommended to extend the GRF models to meet the requirements of MAP-21 federal target setting.
Download or read book 2011 Indiana Interstate Mobility Report written by Stephen Remias and published by Purdue University Press. This book was released on 2012-09-01 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2011 Mobility Report—Full Version introduces the use of crowd sourced probe data collected from vehicles and mobile devices to quantify the location and duration of congestion on Indiana interstates. The report presents a detailed case study presented of the I-65 corridor, as well as examples of travel time reliability information for sections of Interstates 65, 70, and 94. Summary monthly mobility statistics for all 943 centerline miles of Indiana Interstates 64, 65, 69, 70, 74, 94, and 465 are tabulated in a graphical format to facilitate comparison of mobility along those corridors. The report contains three appendices. Appendix A details the location of congestion pockets on each corridor. Appendix B provides quantitative summary of congestion for each interstate by month and direction. Appendix C provides travel time reliability statistics along three corridors in northern Indiana, twelve corridors in central Indiana, and four corridors in southern Indiana.
Download or read book 2011 Indiana Interstate Mobility Report written by Thomas Brennan and published by . This book was released on 2012-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduces the use of crowd sourced probe data collected from vehicles and mobile devices to quantify the location and duration of congestion on Indiana interstates. The report presents a detailed case study of the I-65 corridor, as well as examples of travel time reliability information for sections of Interstates 65, 70, and 94. Summary monthly mobility statistics for all 943 centerline miles of Indiana Interstates 64, 65, 69, 70, 74, 94, and 465 are tabulated in a graphical format to facilitate comparison of mobility along those corridors.
Download or read book Prediction of Interstate Travel Time Reliability Phase II written by Mo Zhao and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate prediction of travel time reliability measures would help state departments of transportation set performance targets and communicate the progress toward meeting those targets as required by the Moving Ahead for Progress in the 21st Century Act (MAP-21). In a recent Virginia Transportation Research Council study, Methods to Analyze and Predict Interstate Travel Time Reliability, researchers developed and tested statistical and machine learning models to analyze and predict travel time reliability on interstate highways. The generalized random forest (GRF) model showed promise in terms of data processing (no need for pre-clustering of travel times) and the relative accuracy of the results and was recommended for further evaluation by the study’s technical review panel. The current study directly adapted the previously developed GRF models to meet the requirements of MAP-21 federal target setting. In particular, the GRF approach developed using the INRIX Traffic Message Channel network for weekday peak period traffic by the prior study was successfully (1) adapted to the federally required National Performance Management Research Dataset (NPMRDS) network, and (2) expanded to cover the weekday midday and weekend daytime periods. The technical review panel was also interested in practical steps to implement the predictive models. To that end, suggested procedures for applying the new GRF models—including relevant model inputs and data preparation steps—are documented in this report. Direct application of the GRF models trained with INRIX data (2017-2018) to predict travel time reliability measures in 2009 on the NPMRDS network highlighted the need for developing new GRF models targeted to the NPMRDS network, especially when the 90th percentile travel time was predicted. Whereas the INRIX models showed mean absolute percentage errors of 37% and 51% for freeway and interchange segments, respectively, for the PM peak hours, the new GRF models (trained with 2017-2018 NPMRDS data) had relatively smaller mean absolute percentage errors of 34% for freeway segments and 38% for interchange segments depending on how work zones were characterized and how data were aggregated. Because operational improvements are often evaluated on the basis of how they improve reliability, especially on how the 90th percentile travel time is affected, the new GRF models are relevant for planning operational investments. In addition, because many of these improvements affect interchanges, the remedy of the new GRF models is essential for evaluating weaving strategies or traveler information systems that could be implemented at these locations.
Download or read book 2013 2014 Indiana Mobility Report written by Christopher Day and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2013-2014 Indiana Mobility Report: Summary Version examines the mobility performance of Indiana's state highway system. Minute-by-minute crowdsourced probe vehicle speed data and vehicle volume data were used to develop performance measures that identify, quantify, and visualize the location and duration of congestion on Indiana Interstates. The summary report presents overall system performance, including a monthly overview covering January 2011 through June 2014 as well as selected highlights of significant projects. In addition to the Interstate system, the report characterizes selected high-priority arterial corridors to rank their mobility performance in terms of travel time and travel time reliability.
Download or read book Integrating Travel Time Reliability Into Management of Highways written by David Lewis Adams and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With increasing traffic congestion, travel time reliability is becoming an important measure for travelers and freight shippers to plan trips. While adding lanes to increase highway capacity may be very expensive, transportation agencies can provide travel time information to customers at a relatively minimal cost. The Washington State Department of Transportation has initiated an innovative program to achieve this goal (WSDOT). This information can take various forms, and different methods can be employed to improve travel time itself. This thesis presents WSDOT's travel time reliability program as a case study. Data on speeds from Pennsylvania are then analyzed to better understand how one measure of travel time reliability, the 95 th percentile travel time, varies by time of day and day of the week. Finally, the thesis explains the applicability of travel time reliability as a performance measure to be used in decision-making. Travel time reliability should certainly be a measure in a transportation agency's goal of improved customer service.
Download or read book 2012 Indiana Mobility Report written by Stephen Remias and published by . This book was released on 2013-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2012 Mobility Report: Full Version introduces the use of crowd sourced probe data collected from vehicles and mobile devices to quantify the location and duration of congestion on Indiana interstates. The report presents a summary of the I-65 corridor, I-465, and I-94 speed profiles. Summary monthly mobility statistics for all 943 centerline miles of Indiana Interstates 64, 65, 69, 70, 74, 94, and 465 are tabulated in a graphical format to facilitate comparison of mobility along those corridors in both 2011 and 2012. In addition to the Interstate, the report describes arterial travel time characteristics for SR 37 as well as before/after analysis of a traffic signal retiming project on US 31 in Kokomo. The full version is 246 pages and includes the following appendices: * Appendix A: 2011 & 2012 Interstate Speed Profiles * Appendix B: 2011 & 2012 Interstate Speed Profiles with Linear Distance Scaled * Appendix C: 2011 & 2012 Interstate Congestion Hours Summaries * Appendix D: 2011 & 2012 Interstate Summary Statistics * Appendix E: 2011 & 2012 Interstate Segment Congestion Rankings * Appendix F: 2011 & 2012 Interstate and Arterial Corridor Travel Time Summaries * Appendix G: Performance Measure Calculation Details
Download or read book Monitoring Travel Time Reliability on Freeways written by Huizhao Tu and published by . This book was released on 2008 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluating the Impacts of Time Of Day Tolling on Indiana Roadways written by Satish Ukkusuri and published by . This book was released on 2017-10-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent decades, tolling has been implemented in many highways, bridges, and tunnels for generating revenues for construction, management, and maintenance. To setup tolling scenarios, traditional methods, such as surveys and public hearing, are time and cost consuming. In addition, there likely have various impacts for the different levels of toll. However, there is a lack of handy tool for analyzing the impacts of time-of-day tolling on roadways. Therefore, the purposes of this project are: 1) propose a model to capture the relationship between the time-of-day toll and route choice; 2) develop a TOD analysis software that is convenient for quickly evaluating the impacts of various time-of-day tolling scenarios; 3) easy visualize traffic flows on roadways through different toll rates; 4) and graphically illustrate the revenue, monetary savings, travel times, speeds, VHT, VMT, and welfare from the results. The TOD analysis pack can help to reduce drastically the time and effort in analyzing the costs and impacts of any time-of-day tolling project. It also provides a convenient and flexible tool for testing the impacts of various tolling scenarios for any highway. The visualization features can illustrate the diversion of traffic due to tolling implementation, and can display the top-ten most impacted roads. The TOD analysis pack can seamlessly be jointed-up with the existing TransCAD models that already exist at INDOT. Moreover, the application can be integrated with Google Maps, which provides additional information for users.
Download or read book Cost effective Performance Measures for Travel Time Delay Variation and Reliability written by National Cooperative Highway Research Program and published by Transportation Research Board. This book was released on 2008 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB¿s National Cooperative Highway Research Program (NCHRP) Report 618: Cost-Effective Performance Measures for Travel Time Delay, Variation, and Reliability explores a framework and methods to predict, measure, and report travel time, delay, and reliability from a customer-oriented perspective.
Download or read book Transportation Statistics written by Brian W. Sloboda and published by J. Ross Publishing. This book was released on 2009 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, transportation systems have been judged on performance-based outcomes, thus, quantitative methods have become increasingly important to such assessments. This definitive reference will equip you with state-of-the-art statistical tools used in transportation modeling, how to interpret results and analyze the implications of those results.
Download or read book Travel Time Study written by Indiana. State Highway Commission (1961-1981). Division of Planning and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Value of Travel Time Reliability in Transportation Decision Making written by and published by . This book was released on 2015 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's second Strategic Highway Research Program (SHRP 2) Report S2-L35B-RW-1: Value of Travel Time Reliability in Transportation Decision Making: Proof of Concept--Maryland addresses how an agency can include a value of travel time reliability in a benefit-cost analysis when making congestion reduction-related project investment decisions.
Download or read book Travel Time Reliability Study Report written by Minnesota. Department of Transportation. Office of Investment Management and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Incorporating Travel Time Reliability Into the Highway Capacity Manual written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's second Strategic Highway Research Program (SHRP 2) Report S2-L08-RW-1: Incorporation of Travel Time Reliability into the Highway Capacity Manual presents a summary of the work conducted during the development of two proposed new chapters for the Highway Capacity Manual 2010 (HCM2010). These chapters demonstrated how to apply travel time reliability methods to the analysis of freeways and urban streets.
