Development of Safety-Based Level-of-Service Parameters for Two-Way Stop-Controlled Intersections

1998 ◽  
Vol 1635 (1) ◽  
pp. 127-132
Author(s):  
Soo-Beom Lee ◽  
William D. Berg
Keyword(s):  
Service Evaluation ◽  
Evaluation Framework ◽  
Level Of Service ◽  
Pavement Condition ◽  
Intersection Safety ◽  
Sight Distance ◽  
Traffic Composition ◽  
Safety Considerations ◽  
Intersection Geometry ◽  
Acceptance Research

Current methods for evaluating level of service at two-way stop-controlled intersections do not account for safety considerations. One of the most important factors influencing intersection safety is the availability of adequate sight distance. However, current recommended intersection sight distance criteria do not explicitly consider variability in traffic composition, vehicle characteristics, pavement conditions, or driver characteristics such as perception-reaction time and minimum gap acceptance. Research was therefore undertaken to develop and validate a method where the safety of a two-way stop-controlled intersection could be estimated based on parameters such as intersection geometry, traffic volume, pavement condition, traffic composition, and available sight distances. Simulation modeling was used to estimate the frequency of potential conflicts or collisions resulting from sight distance restrictions. The potential severity of the collisions was modeled using kinetic energy principles. A method for incorporating the results into a level-of-service evaluation framework was then developed.

scholarly journals Intersection Sight Distance Characteristics of Turbo Roundabouts

Designs ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 16
Author(s):  
Akshay Salwan ◽  
Said M. Easa ◽  
Narayana Raju ◽  
Shriniwas Arkatkar
Keyword(s):  
North America ◽  
Mathematical Optimization ◽  
Critical Parameters ◽  
Practical Applications ◽  
Sight Distance ◽  
Large Numbers ◽  
Mathematical Formulas ◽  
Lateral Clearance ◽  
Intersection Geometry ◽  
Mathematical Characteristics

A turbo roundabout uses spiral circulatory roads for effectively counteracting the problems faced in modern multilane roundabouts. First developed in 1996, the turbo roundabout has an advantage over the conventional roundabout regarding capacity and safety. Turbo roundabouts are still in the developing phase in North America, but even in the European subcontinent where they exist in large numbers, reliable analytical studies on the critical parameters of roundabout visibility are lacking. Visibility (sight distance) helps to shape the geometry of the intersection and aids in safety. This paper presents the mathematical characteristics of the intersection geometry and intersection sight distance (ISD) of the turbo roundabout. Mathematical formulas are presented for the sight distance from the approaching vehicle to the conflicting-entering and circulating vehicles. The maximum lateral clearances to the conflicting vehicles are derived using mathematical optimization. The developed analytical method is verified graphically using AutoCAD. To assist in practical applications, design aids for the maximum lateral clearance are presented. The presented method and design aids should aid in promoting safety at turbo roundabouts.

scholarly journals Airport level of service: A model according to departing passengers’ perceptions at a small-sized airport

2017 ◽  
Vol 7 (1) ◽  
pp. 65 ◽  
Author(s):  
Max Well Elias Gonçalves ◽  
Mauro Caetano
Keyword(s):  
Factor Analysis ◽  
Conceptual Model ◽  
Exploratory Factor Analysis ◽  
Air Transportation ◽  
Service Evaluation ◽  
Three Dimensions ◽  
Level Of Service ◽  
Relative Importance ◽  
Transportation Management ◽  
Management Perspective

Purpose: This study proposes a conceptual model of level of service evaluation to a small-sized airport with a focus on departing passengers.Design/Methodology: The variables selected to compose the model were chosen according to their adequacy to departing passengers and the airport’s characteristics. A survey was conducted, and, posteriorly, exploratory factor analysis was used in order to verify the adequacy of the conceptual model proposed and also to improve it according to the results obtained.Findings: The results show that the level of service of the airport is composed of three dimensions: airport characteristics, passenger processing, and prices. The relative importance of the dimensions according to their contribution to the composition of the airport’s overall level of service was also determined.Originality/value: The paper combines theoretical and practical findings in a model for level of service evaluation to a small-sized airport from an air transportation management perspective.

scholarly journals Dual-Level Evaluation Framework for Airport User Satisfaction

2021 ◽  
Vol 12 (1) ◽  
pp. 17-30
Author(s):  
Dimitrios Dimitriou ◽  
Maria Sartzetaki ◽  
Iliana Kalenteridou
Keyword(s):  
Service Quality ◽  
User Satisfaction ◽  
Holistic Approach ◽  
Evaluation Framework ◽  
Transport Infrastructure ◽  
Level Of Service ◽  
Northern Greece ◽  
Modeling Framework ◽  
Traffic Demand ◽  
Satisfaction Evaluation

Passenger's satisfaction evaluation is very complicated for transport infrastructure services that accommodate high demand, mainly due to international passenger's quality attitudes, expectations, and experiences. This paper focuses on the development of the methodological framework to assessing level of service quality at airports, adopting two evaluation layers: the level of service (efficiency to manage traffic demand) and the level of expectation (performance to accommodate traveler's needs). The conceptual framework develops a holistic approach to evaluate overall level of service quality of an airport. A modeling framework then is developed to test the reliability of the level of quality and the consistency of airport level of service and level of passengers expectation. The methodology is applied in a small sized airport the Democritus Airport in Alexandroupolis, in Northern Greece. The analysis explores the passenger's satisfaction level for Greek regional airports and highlights the consistency of level of airport service and passenger's level of expectations.

scholarly journals Understanding Pedestrian Interactive Behaviors under the Different Level of Services on Stairways

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Jianhong Ye ◽  
Xiaonian Shan ◽  
Xiaohong Chen ◽  
Mengxiao Yu
Keyword(s):  
Service Evaluation ◽  
Level Of Service ◽  
Field Observations ◽  
Highway Capacity ◽  
Metro Station ◽  
Highway Capacity Manual ◽  
Pedestrian Traffic ◽  
Similarities And Differences ◽  
Interactive Behaviors ◽  
Main Factor

Stairways serve as important walking facilities for pedestrians, especially in metro stations, but researches of pedestrian traffic on stairways are not sufficient. This paper investigates pedestrian interactive behaviors (PIBs) under the different level of services (LOS) on stairways, including overtaking behavior and evasive behavior on stairways. Macro and micro indicators are proposed and calculated based on field observation collected from two stairway flights in a certain metro station in Shanghai, China. Results of macro indicators reveal that the characteristics of overtaking behavior and evasive behavior have both similarities and differences. As for similarities, neither of these two types of behaviors would occur under extremely low or high densities, representing LOS A or LOS F. Under other ranges of density, occurrence intensities of pedestrian interactive behaviors on stairways are different. Overtaking behavior intensity shows a rapid increase trend with the density from low to medium, while evasive behavior intensity keeps a certain value. Results of micro indictors show that the available space for overtaking behavior and evasive behavior is the main factor contributing to the above similarities and differences. Characteristics of PIBs under the different LOS present in highway capacity manual are discussed based on field observations. Findings of this research are helpful to understand the knowledge of PIBs on stairways for a better stairway traffic design and level of service evaluation.

Evaluation on Urban Public Transit Operational Level of Service Based on Public Transportation Priority Strategy

2012 ◽  
Vol 253-255 ◽  
pp. 1900-1905
Author(s):  
Yang Bian ◽  
Lin Zhao ◽  
Jian Rong ◽  
Jian Cheng Weng
Keyword(s):  
Development Strategy ◽  
Public Transportation ◽  
Public Transit ◽  
Service Evaluation ◽  
Level Of Service ◽  
The Public ◽  
Operational Level ◽  
Passenger Satisfaction ◽  
The Index System ◽  
Implementation Effect

This paper started from the perspective of the implementation effect of public transportation priority development strategy, and studied on the evaluation of urban public transit operational level of service, then whether the strategy was well put into effect could be examined. On the basis of the existing research on the evaluation index of public transit operational level of service, this paper carried out a microscopic level of service evaluation on public transportation priority strategy. Then the effect of the strategy was analyzed from the level of passengers’ satisfaction. At last, the result of this strategy was examined by the increasing of proportion of the public transportation travelers. Finally, according to the establishment of the index system, it was analyzed respectively from the two aspects of objective and subjective with the combination of AHP and passenger satisfaction survey. Then the grade of urban public transit operational level of service could be obtained.

A global index for level of service evaluation at airport passenger terminals

2008 ◽  
Vol 44 (4) ◽  
pp. 607-620 ◽  
Author(s):  
Anderson Ribeiro Correia ◽  
S.C. Wirasinghe ◽  
Alexandre G. de Barros
Keyword(s):  
Service Evaluation ◽  
Level Of Service ◽  
Global Index ◽  
Passenger Terminals
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