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Author:
Publisher:
ISBN:
Category : Automobile drivers
Languages : en
Pages : 54
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Book Description
Freeway bottlenecks are a primary source of congestion, and the removal of several bottlenecks in Dallas has shown a favorable reduction in delay. Solving a freeway bottleneck can be highly complex, and existing analytical tools have been inadequate for congested conditions. Driving behaviors in congestion were observed at several sites on freeways in Dallas and include queue jumping, weaving in congestion, and shoulder driving. These observations have furthered the understanding of freeway operations in congestion. A survey of what other agencies are using to simulate congested freeway operations showed that FRESIM is the most widely used simulation tool. Several adaptations to the use of FRESIM were identified and tested. These refinements to the application of the FRESIM model allow for better analysis of congestion and bottleneck improvements. Assessing the benefit a bottleneck removal provides to the motorists remains incomplete. In cases where the bottleneck is simple and well-defined, benefits may be fairly easy to estimate. However, the benefits to motorists are not always obvious. This research enhances the reliability of bottleneck improvement benefits by identifying options to the traditional methodology for assessing benefits.
Author:
Publisher:
ISBN:
Category : Automobile drivers
Languages : en
Pages : 54
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Book Description
Freeway bottlenecks are a primary source of congestion, and the removal of several bottlenecks in Dallas has shown a favorable reduction in delay. Solving a freeway bottleneck can be highly complex, and existing analytical tools have been inadequate for congested conditions. Driving behaviors in congestion were observed at several sites on freeways in Dallas and include queue jumping, weaving in congestion, and shoulder driving. These observations have furthered the understanding of freeway operations in congestion. A survey of what other agencies are using to simulate congested freeway operations showed that FRESIM is the most widely used simulation tool. Several adaptations to the use of FRESIM were identified and tested. These refinements to the application of the FRESIM model allow for better analysis of congestion and bottleneck improvements. Assessing the benefit a bottleneck removal provides to the motorists remains incomplete. In cases where the bottleneck is simple and well-defined, benefits may be fairly easy to estimate. However, the benefits to motorists are not always obvious. This research enhances the reliability of bottleneck improvement benefits by identifying options to the traditional methodology for assessing benefits.
Author: John C. Brunk
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 54
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Book Description
The System Planning Methodology was developed jointly by the Texas Department of Transportation (TxDOT), North Central Texas Council of Governments (NCTCOG), Dallas Area Rapid Transit (DART), and Texas Transportation Institute (TTI) as a transportation corridor and system analysis tool that would bridge the gap between regional planning and detailed corridor design. It allows for the examination of peak hour person movement for different facility types within a corridor and estimates associated public costs (e.g., right-of-way, construction, operation, congestion, and environmental costs). The objective of the methodology is to find the lowest total public cost alternative. This project extends the methodology to include costs associated with traffic incidents (nonrecurrent congestion) and tests the results on five corridors in the Dallas area to determine if it alters the recommended alternative previously identified for each corridor. It also adds toll lanes and high occupancy/toll lanes (HOT) as alternatives that can be evaluated against other combinations of general purpose lanes, high occupancy vehicle (HOV) lanes, and express lanes.
Author:
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ISBN:
Category : High occupancy vehicle lanes
Languages : en
Pages : 52
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Book Description
Limited capital investment for major transportation improvements and growth in metropolitan areas require the most efficient use of the existing transportation system. One means to achieve this is high-occupancy vehicle (HOV) lanes. While an extensive system of permanent HOV lanes is planned for the Dallas-Fort Worth urbanized area, the Texas Department of Transportation (TxDOT) and Dallas Area Rapid Transit (DART) have pursued and continue to pursue short-term or interim HOV lane projects that would enhance public transportation and overall mobility. There are currently 57 km (35.4 mi) of interim HOV lanes operationalin the Dallas area, including a barrier separated contraflow lane on I-30 (East R.L. Thornton Freeway) and buffer-separated concurrent flow HOV lanes on I-35E North (Stemmons Freeway) and I-635 (Lyndon B. Johnson Freeway). The objective of this research is to investigate the operational effectiveness of the new concurrent flow HOV lanes in the Dallas area, as well as to assess the effectiveness of concurrent flow (buffer-separated) versus contraflow (barrier-separated) HOV lanes. Issues such as person movement, carpool formation, travel time savings, violation rates, and project cost effectiveness are addressed. By understanding the operational performance and issues of both concurrent flow (buffer-separated) HOV lanes and contraflow (barrier-separated) HOV lanes, recommendations can be made on suggested HOV lane policies, including the type of permanent HOV lanes to be implemented in the Dallas area.
Author: Ponte-Travers Associates
Publisher:
ISBN:
Category : Central business districts
Languages : en
Pages : 96
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Author:
Publisher:
ISBN:
Category : Highway capacity
Languages : en
Pages : 86
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Book Description
This study reexamines the traditional use of the 30th highest hourly volume as the optimum design hour volume given the current era of limited funding, constrained right-of-way, environmental concerns, and increasing congestion. The report documents the Dallas/Ft. Worth region's use of an alternative design hour volume (4th highest hour of the day) based on funding constraints. The use of an alternative design hour volume requires that the planned system be optimized to manage peak person trip flows by identifying the best mix of general purpose, high occupancy and express lanes, and an aggressive program of transportation system management and demand management strategies A methodology is outlined to use a peak hour traffic model to forecast traffic volumes for different hours of the day. This approach has the potential to avoid some of the shortcomings of using average values for peak hour factors, directional split, and trucks to obtain hourly design volumes from daily forecasts. If congestion is accepted during the peak hours of the day, then the design process for a facility must expressly consider congested conditions. Nine design elements that pose operational/safety concerns were examined under congested conditions to identify basic guidelines that should be considered when designing for congestion.
Author: Marvin Springer and Associates
Publisher:
ISBN:
Category : Transportation
Languages : en
Pages : 152
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Author: Texas. Highway Department
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 254
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Author: Minnesota. Department of Highways
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 178
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Author: Dallas Master Transit Plan Committee
Publisher:
ISBN:
Category : Urban transportation
Languages : en
Pages : 126
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Book Description
Author:
Publisher:
ISBN:
Category : Transportation, Automotive
Languages : en
Pages : 338
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Book Description
