Journal of Transportation Engineering, Part A: Systems: Recent submissions
Now showing items 3941-3960 of 4147
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Performance and Selection of Rigid and Flexible Pipes
(American Society of Civil Engineers, 1986)The increasing number of pipe breaks and resulting contamination, the aging of existing underground pipelines, and the economics and engineering involved in procuring and installing new underground pipelines have led to ... -
Criteria for Predicting Hydroplaning Potential
(American Society of Civil Engineers, 1986)Two independent state-of-the-art equations for incipient hydroplaning speeds, which were regressed from experimental data for different ranges of magnitudes of water film thicknesses, are investigated relative to merging ... -
Study of Airport Access Mode Choice
(American Society of Civil Engineers, 1986)This paper reports on an investigation of air traveler behavior in choosing a mode of access to the airport. Data from a 1980 survey of departing air passengers in the San Francisco Bay Area were used to study the ... -
Evaluation of Staggered and Cross Intersections
(American Society of Civil Engineers, 1986)This paper presents an evaluation of two types of staggered intersections compared with a four‐leg cross intersection, with the aim of analyzing the safety and operational characteristics of the intersection layout. The ... -
Design Hourly Volume from Road Users' Perspective
(American Society of Civil Engineers, 1986)The tradition of selecting the 30th highest hourly volume or what is known as the ``knee-of-curve'' approach for road design is based mainly on the facility utilization because it permits a given road facility to be congested ... -
Cost of Road Maintenance in Developing Countries
(American Society of Civil Engineers, 1986)A road network system is perhaps one of the most important necessities for the economic development of developing countries. In this paper, the result of the case studies of over 20 years' data of the Nigerian situation ... -
Development of Highway Accident Hazard Index
(American Society of Civil Engineers, 1986)The objective of this study was to develop an accident hazard index (AHI) for use by traffic engineers for an overall look at the highway safety problem within a state, and to identify those counties with serious highway ... -
Minimum‐Cost Design of Pipelines
(American Society of Civil Engineers, 1986)Three formulas are presented for designing pipelines of optimum diameter with equally‐spaced, similar pumping units. Each of the three formulas corresponds to a particular zone on a Moody diagram, namely, laminar flow, ... -
Simplified Railroad Capacity Analysis Model
(American Society of Civil Engineers, 1986)A microcomputer‐based railroad capacity analysis model is described which allows for interactive use. Train dynamics are calculated in a simplified way and the computer program displays the space‐time trajectories of ... -
Urban Freeway Traffic Management Technology
(American Society of Civil Engineers, 1986)This paper presents an overview of current management techniques that are aimed at improving the efficiency and productivity of urban freeways. The major topics that are addressed include capacity management techniques ... -
Buried Flexible Pipe With Nonuniform Soil Support
(American Society of Civil Engineers, 1986)The initial states of stress and deformation of a buried flexible pipe with unsupported haunches are calculated modeling the buried pipe as a cylindrical shell supported on an elastic foundation with nonuniform stiffness. ... -
Coordination of Actuated Arterial Traffic Signal Systems
(American Society of Civil Engineers, 1986)Coordinated timing plans may be developed for actuated signal systems but all existing optimization methods require that each actuated signal be converted to its nearest equivalent pretimed unit. Using bandwidth maximization ... -
Integrated Model for Project‐Level Management of Flexible Pavements
(American Society of Civil Engineers, 1986)Pavement management systems usually focus on life‐cycle cost as the most important criterion for selecting the optimal pavement strategy at the project level. Pavement management decisions, however, are made in the context ... -
Soil Stress Distribution around Buried Pipes
(American Society of Civil Engineers, 1986)An extensive experimental study of flexible and semi‐rigid pipes subjected to soil and superimposed loads was carried out in a large laboratory soil box. Normal and tangential soil stresses were measured by plane‐stress ... -
Deflections and Bending Moments in Buried Pipes
(American Society of Civil Engineers, 1986)An experimental study of the interaction of soil and buried pipes was carried out with a view to improve underground pipeline design. Six pipes of different rigidities were tested in a large soil box. Radial deflections ... -
Polychlorinated Biphenyls in Bituminous Materials
(American Society of Civil Engineers, 1986)A method developed for the extraction of polychlorinated biphenyls (PCBs) from bituminous materials and subsequent analysis using electroncapture gas chromatography is presented. The procedure is tested by spiking asphalt ... -
Moiré Applied to Real‐Time Inspection of Highways
(American Society of Civil Engineers, 1986)A rationalized planning of highway maintenance calls for continuous and periodic inspection of the highways. Two parameters of utmost importance in qualifying the quality and behavior of the pavements are the rut depths ... -
Simulation Study of Bus Transit
(American Society of Civil Engineers, 1986)A computer simulation model has been developed to evaluate the impacts of various transportation‐system management measures on the performance of bus transit. The model is applied to a major urban route to demonstrate the ... -
Culvert‐Soil Interaction Finite Element Analysis
(American Society of Civil Engineers, 1986)A culvert‐soil structural model developed using general purpose finite element codes is described. Features of culvert specific codes such as incremental construction and Duncan's soil model are incorporated in the model ... -
Economic Impacts and Transportation Projects
(American Society of Civil Engineers, 1986)Insights into available methods of evaluating the economic impact of transportation projects or programs on the state or local economy are presented. Applications as examples of analysis potential rather than on the ...