Estimation Of Delay And Queue Length At Non Signalized Intersections
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Estimation Of Delay And Queue Length At Non Signalized Intersections
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Author : Mario R. Duran
language : en
Publisher:
Release Date : 1986
Estimation Of Delay And Queue Length At Non Signalized Intersections written by Mario R. Duran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with NETSIM (Computer program) categories.
Delay And Queue Length Estimation At Signalized Intersections Using Archived Automatic Vehicle Location And Passenger Count Data From Transit Vehicles
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Author : Sahar Tolami Hemmati
language : en
Publisher:
Release Date : 2015
Delay And Queue Length Estimation At Signalized Intersections Using Archived Automatic Vehicle Location And Passenger Count Data From Transit Vehicles written by Sahar Tolami Hemmati and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Signalized intersections are typically the capacity bottlenecks within urban road networks. The performance of signalized intersections is typically quantified on the basis of average vehicle delay and maximum queue lengths. In practice, these measures of performance are commonly estimated using tools that implement the methods from the Highway Capacity Manual. These methods, which have been derived from deterministic and stochastic queuing theory, estimate delay and queue length on the basis of geometry, signal timings, turning movement counts (TMC), vehicle stream composition, etc. The cost and effort required to acquire these data, and particularly the TMCs, result in TMCs being collected for a single day every several years. Thus, estimates of intersection performance are often several years out of date and do not capture day-to-day and seasonal variations in conditions that occur throughout the year. Many transit agencies have deployed Automatic Vehicle Location (AVL) and Automatic Passenger Count (APC) systems on their fleet of transit vehicle. This thesis proposes a methodology to estimate the stopped delay and maximum queue length at signalized intersections on the basis of archived AVL/APC data. This provides the advantage of being able to: (1) estimate intersection performance on the basis of field measurements rather than models; (2) no additional cost or effort is required to acquire the data; and (3) performance can be evaluated throughout the year. Unlike previous methods, the proposed methodology is applicable to intersections with near-side transit stations. The proposed model is evaluated using both simulation and field data and shown to provide satisfactory results.
Real Time Estimation Of Queue Length At Signalized Intersections
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Author : Md. Sekender Ali Khan
language : en
Publisher:
Release Date : 2010
Real Time Estimation Of Queue Length At Signalized Intersections written by Md. Sekender Ali Khan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
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.
Real Time Estimation Of Delay At Signalized Intersections
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Author : Jeffrey W. Buckholz
language : en
Publisher:
Release Date : 2007
Real Time Estimation Of Delay At Signalized Intersections written by Jeffrey W. Buckholz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Trajectory analysis during oversaturated conditions is used to reconcile the difference between stopped delay and the area between the curves. This research also demonstrates that the Highway Capacity Manual (HCM) definition of an initial (residual) queue is incorrect. To identify the true residual queue, the situation must be evaluated at the end of the red interval and thruput during the subsequent green interval must be deducted. Failure to do so leads to overestimation of both the initial queue and the corresponding delay. Another finding is that the random component of the HCM's incremental delay term incorrectly contributes to delay during over-saturated periods preceded by an initial queue. A remedial modification to the d2 term is proposed. Finally, it is demonstrated that the HCM's period-based queue accumulation procedure has drawbacks that can produce substantial errors in delay during over-saturated conditions. A remedial cycle-based counting technique is proposed.
Intersections Without Traffic Signals
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Author : Werner Brilon
language : en
Publisher: Springer
Release Date : 1988
Intersections Without Traffic Signals written by Werner Brilon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Technology & Engineering categories.
From March 16 - 18, 1988, an international workshop on inter sections without traffic signals will take place at the Ruhr University, Bochum. This book, which was compiled prior to the event, comprises the written versions of the contributions pre sented at the workshop. This preface is an attempt to give a short survey of the deve lopment of this particular field of traffic engineering. It has to be said in advance, however, that it is written from a point of view decisively influenced by the relevant German litera ture. Most of the intersections in our road networks are unsignaliz ed. At first glance, however, traffic engineers seem to be more interested in high-performance grade-separated or signalized intersections. But a closer study of the relevant literature does not confirm this apparent lack of importance. On the contrary: The subject of unsignalized intersections is still intensively dealt with at many research institutes. The German observer will notice the following fact while study ing the relevant sources: A remarkably high number of the au thors who have contributed to the investigation of unsignalized intersections in German-speaking countries have later become uni versi ty teachers. There is every reason to believe that traffic engineers primarily interested in theoretical problems have mainly been working in this field.
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.
Effect Of The Analysis Interval On Delay Estimation For Signalized Intersections
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Author : Panos D. Prevedouros
language : en
Publisher:
Release Date : 1987
Effect Of The Analysis Interval On Delay Estimation For Signalized Intersections written by Panos D. Prevedouros and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Roads categories.
Traffic Theory
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Author : Denos C. Gazis
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-04-11
Traffic Theory written by Denos C. Gazis and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-04-11 with Business & Economics categories.
“Everything should be made as simple as possible—but not simpler” Albert Einstein Traffic Theory, like all other sciences, aims at understanding and improving a physical phenomenon. The phenomenon addressed by Traffic Theory is, of course, automobile traffic, and the problems associated with it such as traffic congestion. But what causes congestion? Some time in the 1970s, Doxiades coined the term "oikomenopolis" (and "oikistics") to describe the world as man's living space. In Doxiades' terms, persons are associated with a living space around them, which describes the range that they can cover through personal presence. In the days of old, when the movement of people was limited to walking, an individual oikomenopolis did not intersect many others. The automobile changed all that. The term "range of good" was also coined to describe the maximal distance a person can and is willing to go in order to do something useful or buy something. Traffic congestion is caused by the intersection of a multitude of such "ranges of good" of many people exercising their range utilisation at the same time. Urban structures containing desirable structures contribute to this intersection of "ranges of good". xii Preface In a biblical mood, I opened a 1970 paper entitled "Traffic Control -- From Hand Signals to Computers" with the sentence: "In the beginning there was the Ford".
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.