Guidelines for Identifying Improvements at Diamond Interchanges PDF Download
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Author: William R. Stockton
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 124
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Book Description
Author: William R. Stockton
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 124
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 704
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 712
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Book Description
Author: Yvonne D. Irvine
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 98
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Book Description
Author: Afia Sultana
Publisher:
ISBN: 9781622604708
Category :
Languages : en
Pages :
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Book Description
Service interchanges connect freeways to arterial roads and are the backbone of the U.S. road network. Improving the operations of service interchanges is possible by applying one of several new solutions: diverging diamond, single point interchanges, and double or single roundabout diamonds.VISSIM was used to perform 13,500 experiments to simulate the traffic performance of the studied alternative interchanges during a typical day for a wide range of geometry and traffic scenarios. Five performance measures were investigated: daily-average delay, level of service of critical movement, daily-average number of stops, longest off-ramp queue, and longest crossing road queue. The obtained daily-average delays at the alternative interchanges were consistent with expectations. Roundabouts had the highest average delay while single-point interchanges had the lowest average delays. Roundabouts exhibited the lowest numbers of stops among all the alternatives in the low traffic range up to non-freeway 30,000 veh/day. Diverging diamonds tended to have the shortest and roundabouts tended to have the longest queues on their off-ramps. Overall, single-point interchanges had the shortest queues among all the alternatives.The study developed guidelines for early stage screening of alternative diamond. The guidelines exhibit performance measures for 25 traffic and geometric scenarios and a wide range of traffic volumes. The guidelines provide a fair comparison procedure for alternative diamond interchanges in the preliminary planning and conceptual design stages.
Author: Afia Sultana
Publisher:
ISBN: 9781622604692
Category :
Languages : en
Pages :
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Book Description
Service interchanges connect freeways to arterial roads and are the backbone of the U.S. road network. Improving the operations of service interchanges is possible by applying one of several new solutions: diverging diamond, single point interchanges, and double or single roundabout diamonds.VISSIM was used to perform 13,500 experiments to simulate the traffic performance of the studied alternative interchanges during a typical day for a wide range of geometry and traffic scenarios. Five performance measures were investigated: daily-average delay, level of service of critical movement, daily-average number of stops, longest off-ramp queue, and longest crossing road queue. The obtained daily-average delays at the alternative interchanges were consistent with expectations. Roundabouts had the highest average delay while single-point interchanges had the lowest average delays. Roundabouts exhibited the lowest numbers of stops among all the alternatives in the low traffic range up to non-freeway 30,000 veh/day. Diverging diamonds tended to have the shortest and roundabouts tended to have the longest queues on their off-ramps. Overall, single-point interchanges had the shortest queues among all the alternatives.The study developed guidelines for early stage screening of alternative diamond. The guidelines exhibit performance measures for 25 traffic and geometric scenarios and a wide range of traffic volumes. The guidelines provide a fair comparison procedure for alternative diamond interchanges in the preliminary planning and conceptual design stages.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 180
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Author: Brian Ray (Engineer)
Publisher: Transportation Research Board
ISBN: 0309155487
Category : Technology & Engineering
Languages : en
Pages : 194
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Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Report 687: Guidelines for Ramp and Interchange Spacing explores guidelines for ramp and interchange spacing based on design, operations, safety, and signing considerations. The report is designed to help aid the decision-making process when an agency is considering new ramps or interchanges on existing facilities, modifying ramps and interchanges of existing facilities, or when planning and designing new highway and interchange facilities. The guidelines also offer standardized definitions measuring ramp and interchange spacing, which have varied in previous design guides. A final report documenting the full research effort related to the development of NCHRP Report 687 was published as NCHRP Web-Only Document 169--
Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 592
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Book Description
