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Articles 661 - 690 of 992
Full-Text Articles in Civil and Environmental Engineering
Transverse Pavement Markings For Speed Control And Accident Reduction, Kenneth R. Agent
Transverse Pavement Markings For Speed Control And Accident Reduction, Kenneth R. Agent
Kentucky Transportation Center Research Report
Pavement markings were placed ahead of a high-accident location (a sharp curve). Speed and accident studies were conducted before and after. The markings were placed so that drivers otherwise failing to reduce speed would see the markings at an increasing rate. The spacing of lines was intended to create an illusion of acceleration which would cause the driver to slow. Speed is perceived by the visual senses; drivers sense forces resulting from changes in speed but relate and associate speed to the visual field. In laboratory experiments, it has been shown that a driver's perception of speed can be varied …
Occurrences Of Expansive Limestone In Kentucky, Ralph G. Coy, James H. Havens
Occurrences Of Expansive Limestone In Kentucky, Ralph G. Coy, James H. Havens
Kentucky Transportation Center Research Report
No abstract provided.
Irish H & V News - November & December Combined
Irish H & V News - November & December Combined
Building Services Engineering
No abstract provided.
Evaluation Of A Welded Wire Retaining Wall, Jerold Albert Bishop
Evaluation Of A Welded Wire Retaining Wall, Jerold Albert Bishop
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this paper is to evaluate the performance of a Welded Wire Retaining Wall and present design recommendations for its future use. Field data from the instrumentation of a Welded Wire Retaining Wall as well as laboratory data from a study of welded wire fabric as a reinforcing agent for soil was gathered. A study of the theory and practice of reinforced soil construction was made. On the basis of this study and the experimental data obtained, the wall is evaluated and design recommendations presented.
Irish H & V News - April & May Combined
Irish H & V News - April & May Combined
Building Services Engineering
No abstract provided.
Priority Programming For Highway Reconstruction, Charles V. Zegeer, Rolands L. Rizenbergs
Priority Programming For Highway Reconstruction, Charles V. Zegeer, Rolands L. Rizenbergs
Kentucky Transportation Center Research Report
An adequacy-rating procedure was developed for use in priority programming for highway reconstruction. The procedure makes use of 15 roadway and traffic elements to rate highway sections in urban and rural areas based on 100 points. Condition elements (35 points) include a subjective rating of highway foundation, pavement surface, drainage, and maintenance economy. Safety elements (35 points) are stopping sight distance, highway alignment, skid resistance, accident experience, and traffic control devices. Service elements (30 points) include shoulder width, passing opportunity, rideability, surface width, volume/capacity ratio, and average speed.
Some of the advantages of the new procedure include computerized analysis of …
Seatbelt Usage In Kentucky [Nov. 1978], Kenneth R. Agent, Michael Barclay, Robert C. Deen
Seatbelt Usage In Kentucky [Nov. 1978], Kenneth R. Agent, Michael Barclay, Robert C. Deen
Kentucky Transportation Center Research Report
In this report, the effectiveness and usage of seatbelts in Kentucky and factors affecting usage are examined and identified. Data were obtained from three sources: field observations, accident reports, and a questionnaire.
Kentucky drivers and passengers were found to have lower seatbelt usage rates (slightly under 10 percent) than drivers and passengers in other states. The accident data showed that the chances of being killed or severely injured is greatly reduced by wearing a seatbelt. Seatbelts reduced the chance of being killed by a factor of six and the chance of being severely injured by a factor of two. Several …
Pavement Evaluation Using Dynamic Deflections, Gary W. Sharpe, Herbert F. Southgate, Robert C. Deen
Pavement Evaluation Using Dynamic Deflections, Gary W. Sharpe, Herbert F. Southgate, Robert C. Deen
Kentucky Transportation Center Research Report
Dynamic test deflections have been duplicated by elastic theory using the Chevron N-layered computer program. Dynamic surface deflections obtained using the Road Rater have been used in conjunction with elastic theory to analyze pavement behavior. A procedure has been developed to use field measured Road Rater deflections to estimate the elastic moduli of the foundation material and to determine the equivalent thicknesses of new material which approximate the behavior of the structure. The estimated moduli and (or) equivalent thicknesses may be used as inputs to design overlay thicknesses. An analysis of the deflections of the first three sensors of the …
Warrants For Left-Turn Signal Phasing, Kenneth R. Agent, Robert C. Deen
Warrants For Left-Turn Signal Phasing, Kenneth R. Agent, Robert C. Deen
Kentucky Transportation Center Research Report
Warrants for the installation of left-turn phasing were developed. A review of literature was conducted along with a survey of the policies of other states. Field data of delays and conflicts were taken before and after installation of exclusive left-turn signalization. Left-turn delay studies were conducted at intersections with varying volume conditions. Analysis of the effect on accidents of adding a left-turn phase was made. The relationship between left-turn accidents and conflicts was investigated. Other types of analyses concerning gap acceptance, capacity, and benefit-cost ratios were also performed.
It was found that exclusive left-turn phasing significantly reduced left-turn accidents and …
A Rational Thickness Design System For Asphaltic Concrete Overlays, Herbert F. Southgate, Gary W. Sharpe, Robert C. Deen
A Rational Thickness Design System For Asphaltic Concrete Overlays, Herbert F. Southgate, Gary W. Sharpe, Robert C. Deen
Kentucky Transportation Center Research Report
A method of designing asphaltic concrete overlays has been developed making use of (1) Kentucky's proposed design curves, (2) an estimate of future traffic and the associated fatigue (five procedures are presented according to types of information available), (3) strength of subgrade on subject project (laboratory CBR tests or results of dynamic in-place tests such as the Road Rater), and (4) present condition of the existing pavement (from dynamic in-place tests, roughness measurements, or present serviceability index). Deterioration was expressed as reduced thicknesses of new-quality materials producing the same measured dynamic deflections. The total thickness for the predicted traffic minus …
Simulation Of Travel Patterns For Small Urban Areas, Jerry G. Pigman, Robert C. Deen
Simulation Of Travel Patterns For Small Urban Areas, Jerry G. Pigman, Robert C. Deen
Kentucky Transportation Center Research Report
The objective of this study was to develop models which would simulate internal-external trips and external-external (through) trips. Regression analysis and cross-classification of data were tested in an attempt to predict the number of internal-external trips and the percentage of through trips. Regression analysis was used in the development of a through-trip distribution model. Grouping data for analysis created some problems; however, trial-and-error evaluation enabled selection of variables which produced reasonable results. Variables found to be most significant in the development of internal-external models were population and employment. For through-trip models, variables used were population, functional classification, AADT at the …
Green-Extension Systems At High-Speed Intersections [Sept. 1978], Charles V. Zegeer, Robert C. Deen
Green-Extension Systems At High-Speed Intersections [Sept. 1978], Charles V. Zegeer, Robert C. Deen
Kentucky Transportation Center Research Report
The purpose of this study was to determine the effectiveness of green-extension systems (GES) for reducing the dilemma-zone problem associated with the amber phase of traffic signals at high-speed intersections. Reactions of 2,100 drivers were noted during the amber phase at nine intersections, and the dilemma-zone distances with respect to the stop bar were determined.
Before-and-after studies made at three green-extension sites showed a 54-percent reduction in total accidents and a 75-percent reduction in rear-end accidents after GES installation. Accident severity was unaffected.
Conflict, volume, delay, and speed data were taken before and after GES installation at two sites. A …
Irish H & V News Plus Dockrells Supplement
Irish H & V News Plus Dockrells Supplement
Building Services Engineering
No abstract provided.
Green-Extension Systems At High-Speed Intersections [Apr. 1978], Charles V. Zegeer, Robert C. Deen
Green-Extension Systems At High-Speed Intersections [Apr. 1978], Charles V. Zegeer, Robert C. Deen
Kentucky Transportation Center Research Report
The purpose of this study was to determine the effectiveness of green-extension systems (GES) for reducing the dilemma-zone problem associated with the amber phase of traffic signals at high-speed intersections. Reactions of 2,100 drivers were noted during the amber phase at nine Intersections, and the dilemma-zone distances with respect to the stop bar were determined.
Irish H & V News Incorporating Zone
Irish H & V News Incorporating Zone
Building Services Engineering
No abstract provided.