Modeling Of Delay Induced By Downstream Traffic Disturbances At Signalized Intersection
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Modeling Of Delay Induced By Downstream Traffic Disturbances At Signalized Intersection
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Author : Kamran Ahmed
language : en
Publisher:
Release Date : 2006
Modeling Of Delay Induced By Downstream Traffic Disturbances At Signalized Intersection written by Kamran Ahmed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Roads categories.
Effects Of The Quality Of Traffic Signal Progression On Delay
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Author : Daniel B. Fambro
language : en
Publisher: Transportation Research Board
Release Date : 1991
Effects Of The Quality Of Traffic Signal Progression On Delay written by Daniel B. Fambro and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Technology & Engineering categories.
Verifying The Uniqueness Of The D1 D2 D3 And D4 Terms For Modeling The Delay Of Closely Spaced Signalized Intersections
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Author : John R. Engle
language : en
Publisher:
Release Date : 2007
Verifying The Uniqueness Of The D1 D2 D3 And D4 Terms For Modeling The Delay Of Closely Spaced Signalized Intersections written by John R. Engle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Roads categories.
Modeling Capacity And Delay At Signalized Intersections With Channelized Right Turn Lanes Considering The Impact Of Blockage
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Author : Saeedeh Farivar
language : en
Publisher:
Release Date : 2015
Modeling Capacity And Delay At Signalized Intersections With Channelized Right Turn Lanes Considering The Impact Of Blockage written by Saeedeh Farivar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Electronic books categories.
Right-turn channelization is used to improve the capacity at busy intersections with a lot of right-turns. However, under heavy traffic conditions the through lane vehicles might backup and block the right-turn lane. This will affect the discharge rate of right-turning vehicles and reduce the approach capacity and, consequently, increase the approach delay. So if the right-turn channelization is blocked frequently, its advantage is neglected and serious capacity problems can be overlooked. This issue is not addressed in the Highway Capacity Manual (HCM) and no separate model is provided to estimate the capacity and delay of approaches with channelized right-turn lanes. Using conventional methods for estimating the capacity and delay without considering the effect of potential blockage results in overestimation of the approach capacity and underestimation of the approach delay. This research presents probabilistic capacity and delay models for signalized intersections with channelized right-turn lanes considering the possibility of the right-turning vehicles being blocked from accessing the lane. The capacity model was developed by considering the capacity under blockage and non-blockage conditions with respect to the probability of blockage. Subsequently, a model was developed to estimate the probability of blockage. The capacity model is significantly affected by the length of the short-lane section and proportion of right-turn traffic. The proposed capacity model under blockage conditions and also the blockage probability model were validated through VISSIM, a microscopic simulation model. The validation process showed that both models are reliable. For operational purposes, the recommended lengths of the short-lane section were developed which would be useful in evaluating adequacy of the current lengths, identifying the options of extending the short-lane section length, or changing signal timing to reduce the likelihood of blockage. The recommended lengths were developed based on different signal timing plans and several proportions of right-turn traffic. The queue accumulation polygons (QAPs) were used to estimate the approach uniform delay and the HCM procedure was followed for the computation of the incremental delay caused by the random fluctuation of vehicle arrivals. To investigate the effect of blockage on the uniform delay, two different QAPs were developed associated with arrival scenarios under blockage and non-blockage conditions. The proposed delay model was also validated through VISSIM. It was found that, the proposed model can provide accurate estimates of the delay by reflecting the delay increase due to the right-turn channelization blockage. The results showed that the delay of an approach with a channelized right-turn is influenced by the length of the short-lane section and proportion of through and right-turn traffic.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2007
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Dissertations, Academic categories.
Delay Models At Signalized Intersections Considering Short Right Turn Lanes And Right Turn On Red
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Author : Hongyan Gao
language : en
Publisher:
Release Date : 2011
Delay Models At Signalized Intersections Considering Short Right Turn Lanes And Right Turn On Red written by Hongyan Gao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Thesis categories.
The most widely used procedures for estimating delay at signalized intersections are provided by the Highway Capacity Manual (HCM). Despite many revisions, the current HCM delay models lack consideration of short turn lanes and vehicles making a right turn on red (RTOR), both of which are commonly seen in real-life situations. Neglecting the delay caused by short-lane blockages and excluding RTOR traffic, the existing models can underestimate the delay for the signalized intersections. To eliminate these shortcomings of the current HCM, comprehensive delay models were developed by considering the chance of short-lane blockage and right turns proceeding during red. The proposed analytical models were constructed via two different approaches: probabilistic theories and queue accumulation polygons (QAP). They were capable of handling delay estimation given different inputs. The effectiveness and validity of the proposed models were verified by the microscopic simulation model, SimTraffic, which was calibrated based on intersection field data. The proposed models, developed with two different ideologies, showed their distinct advantages. By following the traditional HCM procedures, the probabilistic model only requires basic information as inputs, including traffic volume, saturation flow rate, signal timing plan, and short-lane length. It enhanced the HCM models by being able to handle delay estimation for short right-turn lane and RTOR. By incorporating the RTOR queuing and discharging information, the QAP model overcomes the shortcoming of HCM models where RTOR are directly removed before the capacity or delay analysis. It is better at modeling vehicular arrival and departure for both through and right-turn traffic under various signal control strategies and blockage scenarios. Using the probabilistic model, it was found that the length of the short right-turn lane strongly influences the intersection delay. Delay decreases as the length of the right-turn lane increases. RTOR can reduce the over-saturation, thereby reducing the approach delay substantially, especially when the length of the lane is insufficient to accommodate queuing vehicles. Based on the field data studied in this research, both QAP model and probabilistic model yield better estimates for the approach delay than the HCM model. The results also confirmed that the HCM tends to underestimate the approach delay by ignoring the short-lane blockage and delay contributed by RTOR traffic.
Simulation Analysis Of Adjacent Traffic Signals
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Author : Kiyoshi Yamada
language : en
Publisher:
Release Date : 1983
Simulation Analysis Of Adjacent Traffic Signals written by Kiyoshi Yamada and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Development Of A Modeling Approach To Analyze Intersection Traffic Delay Under The Control Of A Real Time Adaptive Traffic Signal System
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Author : Paul Brian Wolshon
language : en
Publisher:
Release Date : 1997
Development Of A Modeling Approach To Analyze Intersection Traffic Delay Under The Control Of A Real Time Adaptive Traffic Signal System written by Paul Brian Wolshon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Electronic traffic controls categories.
Improving Highway Travel Time Estimation In Fsutms By Considering Intersection Delays
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Author : Fang Zhao
language : en
Publisher:
Release Date : 2006
Improving Highway Travel Time Estimation In Fsutms By Considering Intersection Delays written by Fang Zhao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Roads categories.
Capacity And Operational Effects Of Midblock Left Turn Lanes
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Author : James A. Bonneson
language : en
Publisher: Transportation Research Board
Release Date : 1997
Capacity And Operational Effects Of Midblock Left Turn Lanes written by James A. Bonneson and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Technology & Engineering categories.
The objective of this research project was to develop a methodology for evaluating alternative midblock left-turn treatments on urban and suburban arterials. The methodology had to be applicable to three common midblock left-turn treatments: the raised-curb median, the flush median with two-way left-turn lane (TWLTL) delineation, and the undivided cross section. The methodology developed for this research focuses on the evaluation of midblock street segments on urban and suburban arterials. The basis for NCHRP Report 395.