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Evaluation of Roundabout Capacity Models: An Empirical Case Study 环岛容量模型评价:实证研究
Journal of Transportation Engineering-asce Pub Date : 2016-12-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000878
Liang Ren, X. Qu, H. Guan, S. Easa, E. Oh
{"title":"Evaluation of Roundabout Capacity Models: An Empirical Case Study","authors":"Liang Ren, X. Qu, H. Guan, S. Easa, E. Oh","doi":"10.1061/(ASCE)TE.1943-5436.0000878","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000878","url":null,"abstract":"AbstractBased on field data collected at nine roundabouts in Gold Coast, Australia, this paper evaluates the performance of the capacity estimation for single-lane roundabouts using analytical models [including the highway capacity manual (HCM) 2000 model, the German Highway Capacity Manual (GHCM) model, the signalized and unsignalized intersection design and research aid (SIDRA) model and a new roundabout capacity (NRC) model] and an empirical model (the HCM 2010 model). First, this study calibrates critical gaps, follow-up times, and conflicting flows. Compared with the capacities measured in the field, the authors carry out a study to analyze the accuracy of the HCM, GHCM, SIDRA, and NRC models. The results show that the five models underestimate capacity but the NRC model produces a smaller range of relative error (−1.07 to −5.74%) and root-mean-square deviation (47.68) than the HCM 2010 (−4.62 to −16.14% and 105.00, respectively), HCM 2000 (−5.76 to −17.21% and 115.29, respectively), GHCM (−8.95 to −...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123939729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Automated Roundabout Safety Analysis: Diagnosis and Remedy of Safety Problems 自动环岛安全分析:安全问题的诊断与补救
Journal of Transportation Engineering-asce Pub Date : 2016-12-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000887
H. Sadeq, T. Sayed
{"title":"Automated Roundabout Safety Analysis: Diagnosis and Remedy of Safety Problems","authors":"H. Sadeq, T. Sayed","doi":"10.1061/(ASCE)TE.1943-5436.0000887","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000887","url":null,"abstract":"AbstractThe use of roundabouts is gaining popularity in North America for their safety, capacity, and environmental benefits. Studies have shown that roundabouts can significantly reduce injury collisions compared to stop control and traffic signals. As more roundabouts are constructed, there will be an increased need for a detailed analysis of their safety performance. Traditional road-safety analysis of roundabouts has relied on the use of historical collision records. This approach offers a less-complete understanding of roundabouts safety and their effects on the behavior of drivers, pedestrians, and cyclists. This paper represents a case study where automated video-based traffic conflicts analysis is used to diagnose safety issues at a roundabout in Vancouver, British Columbia, Canada. Traffic conflicts are automatically identified and analyzed to develop an in-depth understanding of the behavior of road users and the causes of traffic conflicts. Conflicts contributing factors were identified and saf...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129130864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
Design and Predeployment Assessment of an Integrated Intersection Dilemma Zone Protection System 综合交叉口困境区防护系统的设计与预部署评估
Journal of Transportation Engineering-asce Pub Date : 2016-12-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000894
Sung Y. Park, C. Lan, G. Chang, D. Tolani, Peter Huang
{"title":"Design and Predeployment Assessment of an Integrated Intersection Dilemma Zone Protection System","authors":"Sung Y. Park, C. Lan, G. Chang, D. Tolani, Peter Huang","doi":"10.1061/(ASCE)TE.1943-5436.0000894","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000894","url":null,"abstract":"AbstractDespite the fact that both traffic researchers and highway agencies have devoted considerable efforts over the past few decades to improving intersection safety, the development of effective strategies remains a challenging task. This research presents an integrated dilemma zone protection system (DZPS) for contending with the safety issues caused by the presence of a dilemma zone, a primary factor contributing to the rear-end collisions or side-angle crashes at intersections, especially at those experiencing high-speed traffic flows. The entire paper includes three parts: (1) development of an integrated system for protecting vehicles within the dilemma zone; (2) procedures to calibrate those key system parameters with field data at a candidate intersection; and (3) design of a per-deployment assessment process for evaluating such a design prior to its field deployment. The proposed DZPS, developed with a target intersection’s traffic characteristic data and geometric constraints, consists of thr...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133753295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Utilizing Statistical Techniques in Estimating Uncollected Pavement-Condition Data 利用统计技术估算未采集路面状况数据
Journal of Transportation Engineering-asce Pub Date : 2016-12-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000898
M. Hafez, K. Ksaibati, R. Anderson-Sprecher
{"title":"Utilizing Statistical Techniques in Estimating Uncollected Pavement-Condition Data","authors":"M. Hafez, K. Ksaibati, R. Anderson-Sprecher","doi":"10.1061/(ASCE)TE.1943-5436.0000898","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000898","url":null,"abstract":"AbstractThe automated techniques used to collect pavement conditions on county roads are relatively expensive for local agencies. This study evaluates the possibility of reducing the amount of pavement condition data collected in each survey to optimize the costs of data collection. This study applies multiple imputation analyses as an assistant tool to estimate the uncollected condition data at the network level. Another objective of this study is to determine the most cost-effective pavement condition data collection frequencies. By using a case study of secondary paved highways in Wyoming, it was concluded that uncollected condition indices can be predicted using the initial/historical values. The imputation models developed in this paper provide good estimations. Cost analysis of county roads for two counties demonstrates the significant amounts of cost saving when applying the proposed imputation strategy during data collection process. Therefore, pavement condition data is not recommended to be coll...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115287048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Contact Phenomenon of Free-Rolling Wide-Base Tires: Effect of Speed and Temperature 自由滚动宽底轮胎的接触现象:速度和温度的影响
Journal of Transportation Engineering-asce Pub Date : 2016-12-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000893
Jaime A. Hernandez, I. Al-Qadi
{"title":"Contact Phenomenon of Free-Rolling Wide-Base Tires: Effect of Speed and Temperature","authors":"Jaime A. Hernandez, I. Al-Qadi","doi":"10.1061/(ASCE)TE.1943-5436.0000893","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000893","url":null,"abstract":"AbstractThe finite-element method was used to quantify the effect of temperature and speed on contact area, deflection, and three-dimensional contact stresses of a free-rolling wide-base tire. The tire model comprised material properties identified in the laboratory and/or provided by the tire manufacturer (hyperviscoelastic rubber and linear elastic reinforcement) and accurate geometry. The model was validated using measured deflection and contact area. The analysis matrix consisted of 81 cases resulting from a combination of three loads, tire-inflation pressures, speeds, and temperatures. Four criteria were used to compare contact stresses: range, average, root-mean-square error, and coefficient of determination. Speed and temperature influence the contact area more than deflection. Longitudinal contact stresses were the most affected, followed by transverse contact stresses. In general, under constant load and tire-inflation pressure, the influence of temperature was more significant on the considered ...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130748709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Case Study of High-Traffic In-Place Recycling on U.S. Highway 49: Multiyear Performance Assessment 美国49号高速公路高流量就地回收案例研究:多年绩效评估
Journal of Transportation Engineering-asce Pub Date : 2016-12-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000900
Ben C. Cox, Isaac L. Howard, A. Middleton
{"title":"Case Study of High-Traffic In-Place Recycling on U.S. Highway 49: Multiyear Performance Assessment","authors":"Ben C. Cox, Isaac L. Howard, A. Middleton","doi":"10.1061/(ASCE)TE.1943-5436.0000900","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000900","url":null,"abstract":"AbstractThis paper documents the in-place recycling of a high-traffic project (12,000 vehicles per day) on U.S. highway 49 (US-49). Sections built included asphalt emulsion–stabilized cold in-place recycling (CIR), portland cement–stabilized CIR, cement-stabilized full-depth reclamation (FDR), and traditional construction. This paper’s objective is to present a case study of US-49 construction and performance through approximately 4.5 years of service. Performance was characterized by a distress survey, cored properties, and falling weight deflectometer testing. In particular, findings demonstrated performance and economic trade-offs between cement CIR and emulsion CIR, which could be directly applied to planning decisions. Emulsion CIR exhibited sufficient rutting capacity but reserve cracking capacity, at higher costs relative to cement CIR. Cement CIR, however, was more economical and exhibited excess rutting capacity but not excess cracking capacity. Because there is little need for reserve capacity o...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121570461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Safety and traffic implications of differential car and truck speed controls for two-lane highways 两车道高速公路上汽车和卡车速度控制差异的安全和交通影响
Journal of Transportation Engineering-asce Pub Date : 2016-11-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000888
A. Ghods, F. Saccomanno
{"title":"Safety and traffic implications of differential car and truck speed controls for two-lane highways","authors":"A. Ghods, F. Saccomanno","doi":"10.1061/(ASCE)TE.1943-5436.0000888","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000888","url":null,"abstract":"AbstractDifferential car/truck speed limits have been used to enhance road safety and increase the fuel efficiency of trucks. For two-lane highways, the safety of these differential speed controls could be affected by possible changes in the pattern of car and truck interactions and their associated crash risks, especially as it pertains to overtaking. In this paper, a microscopic simulation model is presented that assesses the safety and traffic implications of differential car/truck speed limits for two-lane highway operations, with emphasis on the overtaking maneuver. Three speed control strategies are considered: uniform posted speed limits (USLs), differential posted car–truck speed limits (DSLs), and differential mandated truck speed limits (MSLs). Mandated limits involve the use of on-board truck limiters or governors with preset maximum thresholds. The results from several simulation tests suggest that DSLs and MSLs reduce the average travel speed (ATS) of the traffic stream. DSL and MSL controls ...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115028413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Road Roughness Evaluation by Curve-Fitting and Subspace-Identification Methods 基于曲线拟合和子空间识别方法的道路不平度评价
Journal of Transportation Engineering-asce Pub Date : 2016-11-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000877
S. Turkay, H. Akçay
{"title":"Road Roughness Evaluation by Curve-Fitting and Subspace-Identification Methods","authors":"S. Turkay, H. Akçay","doi":"10.1061/(ASCE)TE.1943-5436.0000877","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000877","url":null,"abstract":"AbstractIn this paper, for a quarter-car model, root-mean square response variables are calculated for roads classified by the international standard organization, based on the straight-line spectrum models. Covariance expressions are derived for vehicle response variables assuming that the road spectrum is that of a Motor Industry Research Association (MIRA) spectrum and compared with the existing results in the literature. The international standard and the MIRA spectra are then compared with the models delivered by high resolution frequency-domain subspace identification algorithms. The IRI statistic of the quarter-car response is calculated for the road models built by the curve fitting and the identification methods from the measured road spectrum assuming that the road excitation is a zero-mean Gaussian process","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128831792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Evaluation of Railway Track Safety with a New Method for Track Quality Identification 基于轨道质量识别新方法的铁路轨道安全评价
Journal of Transportation Engineering-asce Pub Date : 2016-11-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000855
R. S. Barbosa
{"title":"Evaluation of Railway Track Safety with a New Method for Track Quality Identification","authors":"R. S. Barbosa","doi":"10.1061/(ASCE)TE.1943-5436.0000855","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000855","url":null,"abstract":"AbstractA new method for track inspection is developed to complement traditional geometric methods. An inertial measuring system and a specialized data treatment method is proposed to evaluate railway track safety, observed from the vehicle dynamic performance point of view. System equations for the inverse vehicle dynamic problem, augmented with the suspension torsion equation, are solved to estimate the wheels driving forces that are directly correlated with the vehicle safety traveling over an irregular track. Results of a measuring campaign on a railway wagon are used to evaluate the present system by direct positional comparison with lateral and vertical contact forces (L/V) safety ratio measured with two instrumented wheelsets (IWS) installed on the leading bogie of the wagon. Also, data collected and treated are compared with track geometry measurements. The results of quantified track safety present good agreement with those found using traditional measuring methods. This confirms the ability of t...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128589736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Innovative Roadside Design Curve of Lateral Clearance: Roadway Simple Horizontal Curves 创新路边横向间隙设计曲线:道路简单水平曲线
Journal of Transportation Engineering-asce Pub Date : 2016-11-01 DOI: 10.1061/(ASCE)TE.1943-5436.0000889
Q. You, S. Easa
{"title":"Innovative Roadside Design Curve of Lateral Clearance: Roadway Simple Horizontal Curves","authors":"Q. You, S. Easa","doi":"10.1061/(ASCE)TE.1943-5436.0000889","DOIUrl":"https://doi.org/10.1061/(ASCE)TE.1943-5436.0000889","url":null,"abstract":"AbstractThe roadside of horizontal curves should be cleared of any obstructions to satisfy sight distance (SD) requirements. This paper proposes an innovative roadside design curve for the required lateral clearance (offset) on simple horizontal curves. The roadside curve consists of a circular curve connected with two spiral curves and exhibits several advantages: (1) it provides a smooth SD profile that improves design consistency; (2) it has beneficial effects on safety for sharp horizontal curves; and (3) it leads to the development of a simple design aid. The roadside curve provides a good approximation of the required lateral offset for roadway simple horizontal curves with a length lesser or greater than the required SD. The results show that approximately two-thirds of the maximum lateral offset required by the American Association of State Highway and Transportation Officials should be provided at half of the required SD upstream and downstream of simple horizontal curves. The concept of roadside...","PeriodicalId":305908,"journal":{"name":"Journal of Transportation Engineering-asce","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128442262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
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