Sensitivity of Rodel Roundabout Delay Estimates to Input Parameters

10.32920/ryerson.14649798 ◽

2021 ◽

Author(s):

Nasim Norouzi

Keyword(s):

The United States ◽

Signalized Intersections ◽

Geometric Parameters ◽

Entry Angle ◽

Research Papers ◽

Traffic Capacity ◽

Traffic Volumes ◽

Vehicle Delay ◽

Minimum Delay ◽

Circle Diameter

Modern roundabouts are developed to increase the traffic capacity and decrease the traffic delay. They are popular around the world and are becoming common in Canada and the United States. A great design of a roundabout is to achieve the minimum delay. According to the research papers regarding the delay at roundabouts, it is expected the vehicle delay, the stop ratio at various traffic volumes, and the level of saturation of roundabouts are smaller than the amount of similar parameters on un-signalized intersections. The purpose of this thesis is clarification and measurement of the geometric parameters through the RODEL software to depict their influence on the sensitivity of roundabout delay. This study has been done through creation and analysis of numerous tables and graphs for various traffic volumes and peak periods. Furthermore, the required accuracy of each parameter in estimating delay of a planned roundabout is determined. The outcome of this analysis indicates the effects of the geometric parameters on the roundabout delay. While the Half Width, Entry Width, and Flare Length have the greatest influence on the delay, the Entry Radius, Entry Angle (PHI), and Inscribed Circle Diameter have the least influence.

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Operational Effects of the Consolidated Intersection Design on Urban and Suburban Arterials

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198118792754 ◽

2018 ◽

Vol 2672 (17) ◽

pp. 96-107

Author(s):

Daniel J. Cook

Keyword(s):

Travel Time ◽

Signalized Intersections ◽

Signal Timing ◽

Left Turn ◽

Vehicle Delay ◽

Cycle Lengths ◽

Expected Benefits ◽

Traffic Signal Timing ◽

Critical Phases ◽

Pedestrian Crossing

Along urban and suburban arterials, closely-spaced signalized intersections are commonly used to provide access to adjacent commercial developments. Often, these signalized intersections are designed to provide full access to developments on both sides of the arterial and permit through, left-turn, and right-turn movements from every intersection approach. Traffic signal timing is optimized to reduce vehicle delay or provide progression to vehicles on the arterial, or both. However, meeting both of these criteria can be cumbersome, if not impossible, under high-demand situations. This research proposes a new design that consolidates common movements at three consecutive signalized intersections into strategic fixed locations along the arterial. The consolidation of common movements allows the intersections to cycle between only two critical phases, which, in turn, promotes shorter cycle lengths, lower delay, and better progression. This research tested the consolidated intersection concept by modeling a real-world site in microsimulation software and obtaining values for delay and travel time for multiple vehicle paths along the corridor and adjacent commercial developments in both existing and proposed conditions. With the exception of unsignalized right turns at the periphery of the study area, all non-displaced routes showed a reduction in travel time and delay. Additional research is needed to understand how additional travel through the commercial developments adjacent to the arterial may effect travel time and delay. Other expected benefits of the proposed design include a major reduction in conflict points, shorter pedestrian crossing and wait times, and the opportunity to provide pedestrian refuge areas in the median.

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Shifting Drivers of Growth: Policy Implications for ASEAN-5

Asian Economic Papers ◽

10.1162/asep_a_00331 ◽

2015 ◽

Vol 14 (1) ◽

pp. 157-173 ◽

Cited By ~ 2

Author(s):

Kong Yam Tan ◽

Tilak Abeysinghe ◽

Khee Giap Tan

Keyword(s):

United States ◽

Business Cycle ◽

The United States ◽

Policy Implications ◽

Structural Vector Autoregression ◽

Research Papers ◽

Vector Autoregression Model ◽

The Subject ◽

Multiplier Effects ◽

Export Destination

How the old saying “when the United States sneezes, the world catches a cold” holds true has been the subject of many research papers on global and country group business cycle synchronization and divergence. Instead of business cycle linkages, however, this paper examines the evolution of the dependence of ASEAN-5 and other Asian economies on their traditional and emerging growth engines (the United States, EU, Japan, China, and India). For this we use a structural vector autoregression model that yields time-varying growth multiplier effects. Although China has overtaken others as a major export destination for ASEAN-5 and despite the United States losing much of its relative economic clout in Asia, the multiplier effects show that the United States is still about 1.5 times more growth-enhancing than China for ASEAN-5. The EU has also not lost out completely to China as a growth engine. China, however, has overtaken Japan to become about 1.88 times more growth enhancing than Japan for ASEAN-5. India has yet to become a significant growth engine, although it is of increasing importance to Singapore, Malaysia, and Indonesia. These results call for new initiatives to balance the rising over-dependence on China.

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Estimation of Truck Traffic Volume from Single Loop Detectors with Lane-to-Lane Speed Correlation

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/1856-11 ◽

2003 ◽

Vol 1856 (1) ◽

pp. 106-117 ◽

Cited By ~ 26

Author(s):

Jaimyoung Kwon ◽

Pravin Varaiya ◽

Alexander Skabardonis

Keyword(s):

Real Time ◽

Time Estimation ◽

The United States ◽

Truck Traffic ◽

Single Loop ◽

Loop Detectors ◽

Time Estimates ◽

Surveillance Technology ◽

Traffic Volumes ◽

Urban Freeway

An algorithm for real-time estimation of truck traffic in multilane freeways was proposed. The algorithm used data from single loop detectors—the most widely installed surveillance technology for urban freeways in the United States. The algorithm worked for those freeway locations that have a truck-free lane and exhibit high lane-to-lane speed correlation. These conditions are met by most urban freeway locations. The algorithm produced real-time estimates of the truck traffic volumes at the location. It also can be used to produce alternative estimates of the mean effective vehicle length, which can improve speed estimates from single loop detector data. The algorithm was tested with real freeway data and produced estimates of truck traffic volumes with only 5.7% error. It also captured the daily patterns of truck traffic and mean effective vehicle length. Applied to loop data on Interstate 710 near Long Beach, California, during the dockworkers’ lockout October 1 to 9, 2002, the algorithm found a 32% reduction in five-axle truck volume.

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Pedestrian Behavior at Signalized Intersection Crosswalks: Observational Study of Factors Associated with Distracted Walking, Pedestrian Violations, and Walking Speed

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198118759949 ◽

2018 ◽

Vol 2672 (35) ◽

pp. 1-12 ◽

Cited By ~ 15

Author(s):

Brendan J. Russo ◽

Emmanuel James ◽

Cristopher Y. Aguilar ◽

Edward J. Smaglik

Keyword(s):

Traffic Safety ◽

Walking Speed ◽

The United States ◽

Ordinary Least Squares ◽

Signalized Intersections ◽

Video Data ◽

High Definition ◽

Pedestrian Behavior ◽

Factors Associated ◽

Walking Speeds

In the past two decades, cell phone and smartphone use in the United States has increased substantially. Although mobile phones provide a convenient way for people to communicate, the distraction caused by the use of these devices has led to unintended traffic safety and operational consequences. Although it is well recognized that distracted driving is extremely dangerous for all road users (including pedestrians), the potential impacts of distracted walking have not been as comprehensively studied. Although practitioners should design facilities with the safety, efficiency, and comfort of pedestrians in mind, it is still important to investigate certain pedestrian behaviors at existing facilities to minimize the risk of pedestrian–vehicle crashes, and to reduce behaviors that may unnecessarily increase delay at signalized intersections. To gain new insights into factors associated with distracted walking, pedestrian violations, and walking speed, 3,038 pedestrians were observed across four signalized intersections in New York and Arizona using high-definition video cameras. The video data were reduced and summarized, and an ordinary least squares (OLS) regression model was estimated to analyze factors affecting walking speeds. In addition, binary logit models were estimated to analyze both pedestrian distraction and pedestrian violations. Ultimately, several site- and pedestrian-specific variables were found to be significantly associated with pedestrian distraction, violation behavior, and walking speeds. The results provide important information for researchers, practitioners, and legislators, and may be useful in planning strategies to reduce or mitigate the impacts of pedestrian behavior that may be considered unsafe or potentially inefficient.

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Validation of Generalized Delay Model for Vehicle-Actuated Traffic Signals

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/1572-13 ◽

1997 ◽

Vol 1572 (1) ◽

pp. 105-111 ◽

Cited By ~ 6

Author(s):

Nagui M. Rouphail ◽

Mohammad Anwar ◽

Daniel B. Fambro ◽

Paul Sloup ◽

Cesar E. Perez

Keyword(s):

North Carolina ◽

Field Data ◽

Traffic Signals ◽

Signalized Intersections ◽

Delay Model ◽

Highway Capacity ◽

Generalized Model ◽

Highway Capacity Manual ◽

Traffic Volumes ◽

Isolated Intersection

One limitation of the Highway Capacity Manual (HCM) model for estimating delay at signalized intersections is its inadequate treatment of vehicle-actuated traffic signals. For example, the current delay model uses a single adjustment for all types of actuated control and is not sensitive to changes in actuated controller settings. The objective in this paper was to use TRAF-NETSIM and field data to evaluate a generalized delay model developed to overcome some of these deficiencies. NETSIM was used to estimate delay at an isolated intersection under actuated control, and the delay values obtained from NETSIM were then compared with those estimated by the generalized delay model. In addition, field data were collected from sites in North Carolina, and delays observed in the field were compared with those estimated by the generalized delay model. The delays estimated by the generalized model were comparable with the delays estimated by NETSIM. The data compared favorably for degrees of saturation of less than 0.8. However, at higher degrees of saturation, the generalized model produced delays that were higher than NETSIM’s. Some possible explanations for this discrepancy are discussed. The delays estimated by the generalized model were comparable with delays observed in the field. Researchers have concluded that the generalized delay model is sensitive to changes in traffic volumes and vehicle-actuated controller settings and that the generalized delay model is much improved over the current HCM model in estimating delay at vehicle-actuated traffic signals.

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GIS Spatial Analysis Modeling for Land Use Change. A Bibliometric Analysis of the Intellectual Base and Trends

Geosciences ◽

10.3390/geosciences10110421 ◽

2020 ◽

Vol 10 (11) ◽

pp. 421 ◽

Cited By ~ 1

Author(s):

Elzbieta Bielecka

Keyword(s):

Land Use ◽

Spatial Analysis ◽

Land Use Change ◽

The United States ◽

Intellectual Structure ◽

Research Papers ◽

Gis Spatial Analysis ◽

European Universities ◽

Land Use Change Modeling ◽

Co Coupling

The paper aimed to express the cognitive and intellectual structure of research executed in the field of GIS-based land use change modeling. An exploration of the Web of Science database showed that research in GIS spatial analysis modeling for land use change began in the early 1990s and has continued since then, with a substantial growth in the 21st century. By science mapping methods, particularly co-coupling, co-citation, and citation, as well as bibliometric measures, like impact indices, this study distinguishes the most eminent authors, institutions, countries, and journals in GIS-based land use change modeling. The results showed that GIS-based analysis of land use change modeling is a multi- and interdisciplinary research topic, as reflected in the diversity of WoS research categories, the most productive journals, and the topics analyzed. The highest impact on the world sciences in the field have can be attributed to European Universities, particularly from The Netherlands, Belgium, Switzerland, and Great Britain. However, China and the United States published the highest number of research papers.

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