Author: R. F. BenekohalPublisher:
ISBN:
Category : Roadside improvement
Languages : en
Pages : 108
Book Description
Accident Savings from Roadside Improvements on Two-lane Rural Highways
Author: R. F. BenekohalPublisher:
ISBN:
Category : Roadside improvement
Languages : en
Pages : 108
Book Description
Accident Mitigation Guide for Congested Rural Two-lane Highways
Author: Kay FitzpatrickPublisher: Transportation Research Board
ISBN: 9780309066242
Category : Transportation
Languages : en
Pages : 176
Book Description
Identification, Quantification and Structuring of Two-lane Rural Highway Safety Problems and Solutions. Volume II - Physical and Safety Characteristics of Two-lane Rural Highways. Final Report
Author: S. A. SmithSafety Improvements for Low Volume Rural Roads
Author: Don L. IveyPublisher:
ISBN:
Category : Low-volume roads
Languages : en
Pages : 88
Book Description
Prioritizing Improvements to Two-lane Highways
Author: Effectiveness of Roadside Safety Improvements
Author: John C. GlennonPublisher:
ISBN:
Category : Roadside improvement
Languages : en
Pages : 76
Book Description
Safety Impacts of Edge Lines on Texas Rural Two-lane Roadways
Author: Nicholas Michael WarrenchukPublisher:
ISBN:
Category : Roads
Languages : en
Pages : 222
Book Description
Roadway crashes are a detriment to our society, so improvements in roadway safety that reduce crashes are of extreme importance. Though it is clear that crashes on our highways are a drain both socially and economically, the contribution of roadway safety to overall community safety is difficult to quantify and has seen many approaches. The study first defines highway safety as a whole, and then focuses on safety improvements on rural two-lane roadways. One such improvement, highway edge lines, may be especially beneficial on such highways. A literature review indicated that edge lines may have a tendency to reduce accident experience on rural, two-lane roads and may affect vehicle speed and lateral position in the lane, which in turn may increase or decrease accident likelihood. After compilation of a database of rural, two-lane roadways in Texas, an accident analysis comparing such roadways with and without edge lines was performed. In addition to general accident frequency analysis taking into account varying traffic lane and shoulder widths and roadway curvature, factors such as accident type, intersection presence, light condition, surface condition, crash-supporting factors, severity, driver age, and driver gender were considered. Further, stationary roadside observations measuring vehicle speed and lateral position were taken during daylight and darkness on three rural, two-lane roadway test sites first without edge lines, and then again after the sites were striped with edge lines. Overall, the accident analysis showed that edge line treatments on rural two-lane roadways may reduce accident frequency, especially run-off-the road frequency, with the highest impact on curves and narrow roadways. The stationary observation analysis indicated some tendency of edge lines to increase vehicle speeds and also decrease speed variations, while moving vehicles toward the pavement edge on narrow roadways, especially at night.
Safety Effects of Cross-section Design for Two-lane Roads. Volume I - Final Report
Author: Charles V. ZegeerPublisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 214
Book Description
This study was intended to quantify the benefits and costs resulting from lane widening, shoulder widening, shoulder surfacing, sideslope flattening, and roadside improvements. Detailed traffic, accident, and roadway data were collected on 4,951 miles of two lane roads in seven states. An accident predictive model and statistical tests were used to determine expected accident reductions related to various geometric improvements. Construction cost data from several states were used to develop a cost model for numerous types of roadway and roadside projects. This volume contains the final report and four appendixes. The final report contains detailed information on data collection and data analysis and conclusions and recommendations. The appendixes contain detailed information on the literature review, photographs used for the rural and urban roadside hazard scales, and economic analysis inputs.
Prediction of the Expected Safety Performance of Rural Two-lane Highways
Author: Douglas W. HarwoodPublisher:
ISBN:
Category : Rural roads
Languages : en
Pages : 200
Book Description
This report presents an algorithm for predicting the safety performance of a rural two-lane highway. The accident prediction algorithm consists of base models and accident modification factors for both roadway segments and at-grade intersections on rural two-lane highways. The base models provide an estimate of the safety performance of a roadway or intersection for a set of assumed nominal or base conditions. The accident modification factors adjust the base model predictions to account for the effects on safety for roadway segments of lane width, shoulder width, shoulder type, horizontal curves, grades, driveway density, two-way left-turn lanes, passing lanes, roadside design and the effects on safety for at-grade intersections of skew angle, traffic control, exclusive left- and right-turn lanes, sight distance, and driveways. The accident prediction algorithm is intended for application by highway agencies to estimate the safety performance of an existing or proposed roadway. The algorithm can be used to compare the anticipated safety performance of two or more geometric alternatives for a proposed highway improvement. The accident prediction algorithm includes a calibration procedure that can be used to adapt the predicted results to the safety conditions encountered by any particular highway agency on rural two-lane highways. The algorithm also includes an Empirical Bayes procedure that can be applied to utilize the safety predictions provided by the algorithm together with actual site-specific accident history data.
Safety Improvements on Horizontal Curves for Two-lane Rural Roads
Author: Charles V. ZegeerPublisher:
ISBN:
Category : Curves in engineering
Languages : en
Pages : 104
Book Description