Journal of Transportation Engineering, Part A: Systems: Recent submissions
Now showing items 3221-3240 of 4147
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New Perspectives for ATMS: Advanced Technologies in Traffic Detection
(American Society of Civil Engineers, 1998)There is a need for advanced traffic management systems (ATMS) on a local and network level to effectively utilize today's transportation system. An automated operating system, with round the clock incident detection, would ... -
Back-Calculation of Concrete Pavement Modulus Using Road-Rater Data
(American Society of Civil Engineers, 1998)This paper deals with the back-calculation of elastic modulus of jointed concrete pavement. A series of road-rater tests are carried out on a jointed, Portland cement concrete (PCC) pavement of a partially completed freeway ... -
Nonlinear Temperature Effects on Multilayered Concrete Pavements
(American Society of Civil Engineers, 1998)This study considers a plate consisting of one or more layers, resting on a general elastic foundation, and subjected to a nonlinear through-the-thickness temperature distribution, together with arbitrary wheel loads. The ... -
Open-Graded Highway Bases Make Permeameter Setup Important
(American Society of Civil Engineers, 1998)The permeability of a highway base layer is measured in the laboratory using a permeameter. The determination of coefficient of permeability (hydraulic conductivity) -
Small-Scale Accelerated Pavement Testing
(American Society of Civil Engineers, 1998)This paper presents the results of a study conducted to explore the use of small-scale models of accelerated pavement testing (APT) devices to evaluate the performance of pavements in conjunction with full-scale tests. The ... -
Path Planning for Machine Vision Assisted, Teleoperated Pavement Crack Sealer
(American Society of Civil Engineers, 1998)During the last few years, several teleoperated and machine-vision-assisted systems have been developed in construction and maintenance areas such as pavement crack sealing, sewer pipe rehabilitation, excavation, surface ... -
Effective Temperature Differential in Concrete Pavements
(American Society of Civil Engineers, 1998)To evaluate curling stresses in concrete pavements requires the input of a temperature differential or even a temperature distribution between the top and bottom of slabs. However, the slab temperature fluctuates throughout ... -
Temperature and Curling Stress in Concrete Pavements: Analytical Solutions
(American Society of Civil Engineers, 1998)Temperature is an important factor influencing the functioning of concrete pavements. In the past, analysis of temperature distribution in pavement has been done using numerical techniques such as finite difference or ... -
Influence of Compactive Efforts and Compaction Delays on Lime-Treated Soil
(American Society of Civil Engineers, 1998)The results of a laboratory study on the influence of standard Proctor and West African standard compactive efforts as well as compaction delays up to 3 h on the compaction and strength characteristics of lateritic soil ... -
General Formulation for Multilayered Pavement Systems
(American Society of Civil Engineers, 1998)A formulation for the analysis of a general multilayered pavement system is developed in a manner analogous to that followed for conventional asphalt concrete pavements. The Burmister analytical solution is expanded to the ... -
Multifrequency Back-Calculation of Pavement-Layer Moduli
(American Society of Civil Engineers, 1998)This paper introduces a frequency-domain back-calculation program, BKGREEN, that can be used to determine the elastic modulus for each pavement layer. The pavement is modeled as a layered elastic system resting over a rigid ... -
Design and Simulation of Large Breakaway Signs
(American Society of Civil Engineers, 1998)Breakaway supports are common devices used for dual-support signs located along the roadway. The sign system utilizes a fuse plate that is designed to support the wind loads on the sign as well as to allow the sign support ... -
Critical Impact Point for Longitudinal Barriers
(American Society of Civil Engineers, 1998)A procedure for identifying critical impact points (CIP) for longitudinal barriers is presented. The procedure is based on computer simulations of longitudinal barrier impacts using the Barrier VII computer program. Critical ... -
Design of Sag Vertical Curves in Three-Dimensional Alignments
(American Society of Civil Engineers, 1998)Headlight sight distance has been an important element in designing sag vertical curves because nighttime drivers need sufficient sight distance for stopping, and also because they depend on the road marking to maintain ... -
Equitable Traffic Assignment with Environmental Cost Functions
(American Society of Civil Engineers, 1998)In the past 10 years increased importance has been placed on public participation and environmental concerns in transportation system decision-making. While there are numerous societal objectives to consider when planning ... -
Viability of Remote Sensing on Two-Lane Roads
(American Society of Civil Engineers, 1998)The objective of this study was to observe how successfully remote-sensing observations can be made on two-lane roads, to identify the factors that affect the success with which observations are made, and to quantify the ... -
Modeling Conflicts of Heterogeneous Traffic at Urban Uncontrolled Intersections
(American Society of Civil Engineers, 1998)The behavior of traffic in the heterogeneous environment of an urban uncontrolled intersection is complex and difficult to model. The present study describes the methodology of simulating the traffic flow and thereby ... -
General Outlook of Pavement and Vehicle Dynamics
(American Society of Civil Engineers, 1997)The interaction between vehicle and pavement is complex since pavement roughness excites the dynamic forces generated by vehicles, while these dynamic forces simultaneously increase the pavement roughness. The objective ... -
Treatment of Uncertainty in Study of Transportation: Fuzzy Set Theory and Evidence Theory
(American Society of Civil Engineers, 1998)This paper examines the nature of uncertainty present in transport planning and explores appropriate mathematical treatment. Two types of uncertainty are dealt with: vagueness and ambiguity. The former refers to the ... -
Discussion and Closure: Traffic Dynamics: Method for Estimating Freeway Travel Times in Real Time from Flow Measurements
(American Society of Civil Engineers, 1997)