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Author: Publisher: ISBN: Category : Express highways Languages : en Pages :
Book Description
This report documents and presents the results of a study for evaluating the performance of Managed Lane (ML) facilities on freeways. A methodological framework is for analyzing freeway facilities with ML and General Purpose (GP) lanes operated in parallel. The framework acknowledges that the composition and behavior characteristics of the ML traffic stream are expected to be quite different from those for the GP lanes in terms of traffic volume, free-flow speed, capacity, vehicle type, etc. It further considers that there may still be certain levels of interactions between these two lane groups, especially for those facilities that do not have physical (barrier) separations, either en route or at access points, between them. Within that framework, different modules were developed based on sensor-measured or simulation-generated data, including the characterization of ML speed-flow relationship, the frictional effect of adjacent lane traffic speed, the adjustment for cross-weave effects, and the development of side-by-side facility-wide ML and GP performance measures. Thus, the proposed methodology is sensitive to different GP and ML segment types (basic, weaving, etc.) and separation styles (none, buffer, barrier), and is capable of analyzing extended facilities across multiple time periods.
Author: Publisher: ISBN: Category : Express highways Languages : en Pages :
Book Description
This report documents and presents the results of a study for evaluating the performance of Managed Lane (ML) facilities on freeways. A methodological framework is for analyzing freeway facilities with ML and General Purpose (GP) lanes operated in parallel. The framework acknowledges that the composition and behavior characteristics of the ML traffic stream are expected to be quite different from those for the GP lanes in terms of traffic volume, free-flow speed, capacity, vehicle type, etc. It further considers that there may still be certain levels of interactions between these two lane groups, especially for those facilities that do not have physical (barrier) separations, either en route or at access points, between them. Within that framework, different modules were developed based on sensor-measured or simulation-generated data, including the characterization of ML speed-flow relationship, the frictional effect of adjacent lane traffic speed, the adjustment for cross-weave effects, and the development of side-by-side facility-wide ML and GP performance measures. Thus, the proposed methodology is sensitive to different GP and ML segment types (basic, weaving, etc.) and separation styles (none, buffer, barrier), and is capable of analyzing extended facilities across multiple time periods.
Author: Jodi Louise Carson Publisher: ISBN: Category : Express highways Languages : en Pages : 155
Book Description
Much of the progress made in advancing the state of the practice in performance monitoring and evaluation has considered general freeway facilities and lacks specificity for managed lane facilities. Managed lane facilities are unique, typically requiring a higher degree of active (sometimes real-time) management, addressing goals and objectives that are inconsistent with the general freeway facility (i.e., revenue generation, person throughput), and accessing an exclusive set of management tools (i.e., gate closures). To address these potential differences between facilities, this investigation was conducted to isolate and document the best performance monitoring and evaluation practices and principles explicitly for managed lane facilities. Despite the novelty of managed lanes as a traffic management strategy, the diversity of managed lane facility types, and the breadth of motivating factors for managed lane implementation, some general consistency in practice was observed with respect to performance monitoring and evaluation. Common goals, objectives, and performance measures were observed across similar facility types. Significant differences were also observed across similar facility types with respect to observed performance outcomes and evaluation methodologies. Differences in observed performance outcomes are likely explained by the variety in facility design (i.e., length of facility, accessibility, etc.) and operation (i.e., eligibility requirements, toll rates, etc.), even within a similar facility type. Differences in the evaluation methodologies used to arrive at these observed performance outcomes are likely reflective of the a vailable resources for analysis at the time of evaluation and the evolving state of analysis methodologies.
Author: American Association of State Highway and Transportation Officials Publisher: American Association of State Highway & Transportation Officials ISBN: 9781560512950 Category : Technology & Engineering Languages : en Pages : 0
Author: Brooke R. Ullman Publisher: ISBN: Category : High occupancy vehicle lanes Languages : en Pages : 46
Book Description
A managed lane facility is one that increases freeway efficiency by packaging various operational and design actions. Operating agencies may adjust lane management operations at any time to better match regional goals. However, as a new concept in operating freeways, managed lanes has a limited experience base, creating a knowledge vacuum in emerging key areas that are critical for effective implementation. The potential complexities associated with user groups and operational options will require agencies to have an appropriate number of qualified staff to ensure adequate oversight of operations and to ensure satisfactory customer service to the users. Thus, the task documented in this report identifies those staffing needs related to operational options and training that might be required to ensure those staff are fully prepared to perform their duties to the satisfaction of both the agency and the customer. Other issues addressed are the roles of job positions within the framework of managed lanes, the competencies required of those positions, and accessibility to appropriate training, education, and technical assistance to ensure these needs are met.
Author: Publisher: ISBN: Category : High occupancy vehicle lanes Languages : en Pages : 112
Book Description
This report describes research sponsored by the Texas Department of Transportation (TxDOT) to develop a decision-support tool to aid in evaluating key issues related to converting a high-occupancy vehicle (HOV) lane to a high-occupancy/toll (HOT) lane. The tool includes three broad categories of factors to consider, including facility considerations, performance considerations, and institutional considerations. Finally, the research incorporates simple trade-off tools to allow TxDOT and local entities to assemble all relevant factors into an analysis to aid decision makers in evaluating the available options. The analysis tool was developed in Visual Basic.Net®. the program is called the High-Occupancy/Toll STrategic Analysis Rating Tool (HOT START), and it is designed to be easily tailored to local needs. The report also provides an application of the tool to a hypothetical freeway.
Author: Publisher: ISBN: 9780309294836 Category : Automobile driving Languages : en Pages : 150
Book Description
"TRB's Transportation Research Record: Journal of the Transportation Research Board, No. 2396 consists of 16 pages that explore collisions in freeway traffic; self-learning adaptive ramp metering; macroscopic travel time reliability diagrams for freeway networks; the impact of heavy vehicles on freeway operating characteristics under congested conditions; an analysis of corridor management strategies; and traffic queue estimations for metered motorway on-ramps. This issue of the TRR also examines an estimation of diversion rate during incidents; travel time reliability on freeway facilities; route travel time distributions; secondary crashes on freeways; weather-responsive traffic management strategies; smart event traffic management; the impacts to transit from variably priced toll lanes; simulating high-occupancy toll lane operations; lane flow distributions on hard shoulder running freeways; and lane-changing behavior along different types of high-occupancy vehicle facilities." -- Publisher's note
Author: Texas Transportation Institute Publisher: Transportation Research Board National Academy of Sciences ISBN: Category : High occupancy vehicle lanes Languages : en Pages : 876
Author: Publisher: ISBN: Category : Highway planning Languages : en Pages : 0
Book Description
This project proposes to improve freeway operations along I-80 and US 50 in Yolo and Sacramento counties by adding a lane through widening and re-striping or by converting the existing general-purpose (GP) lane to a managed lane. Managed lanes are restriced to certain vehicle modes or types and may include tolling.The managed lane would start and end at the Solano County line and connect with the existing HOV lane on I-80 west of West El Camino Avenue and the HOV lane under construction on US 50 at I-5. The project includes installing ramp meters at five locations: eastbound I-80 at SR 113. Old Davis Road, and Richards Boulvard and westbound I-80 at Mace Boulevard and County Road 32A. The project has an opening year of 2029.
Author: Grant Fisher Publisher: ISBN: Category : High occupancy vehicle lanes Languages : en Pages : 60
Book Description
This report documents the development of a decision support methodology that accomplishes two objectives: (1) sorts out the relationships between managed lanes concepts and strategies, and (2) maps the knowledge territory in order to identify gaps. In conjunction with this particular research task, a user-friendly preliminary screening tool has been developed to assist the Texas Department of Transportation (TxDOT) in identifying managed lanes strategy options very early in the conceptual planning process. The framework for the decision support methodology is the backbone for the Managed Lanes Handbook, which offers the resources and guidance to develop a managed lanes project, addressing characteristics unique to individual facilities. This report also summarizes the evolution of managed lanes in Texas over the last five years, the legislative initiatives that have shaped TxDOTs current approach to implementation, and the gaps in the knowledge base that still leave many questions unanswered. At the national level managed lanes are a relatively new and emerging concept. However, TxDOT has led the nation in research and development with two highoccupancy toll (HOT) lanes and 10 freeway high-occupancy vehicle (HOV) facilities in operation and over a dozen managed lanes projects currently under development in 10 Texas cities. Even with the experience to date, there are still many unanswered questions related to the long-term operation of managed lanes and numerous unknown factors that will require further research and documented practical experience through diligent monitoring and evaluation of facilities as they are implemented.
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Author: Jodi Louise Carson
Author: American Association of State Highway and Transportation Officials
Author: Brooke R. Ullman
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Author: Kay Fitzpatrick
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Author: Texas Transportation Institute
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Author: Grant Fisher