Author: Barton E. JenningsPublisher:
ISBN:
Category : Road markings
Languages : en
Pages : 40
Book Description
Testing effect of 3 post-mounted delineation systems on vehicle lateral placement and speed.
Evaluation of Curve Delineation Signs on Rural Highways
Author: Barton E. JenningsPublisher:
ISBN:
Category : Road markings
Languages : en
Pages : 40
Book Description
Testing effect of 3 post-mounted delineation systems on vehicle lateral placement and speed.
Evaluation of Innovative Approaches to Curve Delineation for Two-Lane Rural Roads
Author: Ronald GibbonsPublisher:
ISBN:
Category : Road markings
Languages : en
Pages : 0
Book Description
Run-off-road crashes are a major problem for rural roads. These roads tend to be unlit, and drivers may have difficulty seeing or correctly predicting the curvature of horizontal curves. This leads to vehicles entering horizontal curves at speeds that are too high, which can often lead to vehicles running off the roadway. This study was designed to examine the effectiveness of a variety of active and passive curve warning and curve delineation systems on two two-lane rural roads to determine which is the most effective at reducing vehicle speeds and assisting lane-keeping. The study consisted of a human-factors study, as well as an observational study. There were nine curves examined in the study on two road sections in Southwest Virginia. The human-factors study included participants whose speed and lane position were tracked as they drove through eight curves, both before and after new treatments were installed in each of the eight curves. The observational study examined the speed and lane position of traffic on all the curves before and after the installation of the new treatments. The observational study included a curve on a road near the primary study section. The results of the study were mixed, with every tested system leading to some reductions in speed or encroachments at some parts of the curve while also leading to increases in the same values at other parts of the curve. No clear difference was discovered between passive and active systems or between delineation and warning systems. The study recommends that in addition to a safety assessment, specific curve characteristics and budget should be the main considerations in the selection of a treatment for a curve.
An Evaluation of Warning and Regulatory Signs for Curves on Rural Roads. Final Report
Author: R. W. LylesPublisher:
ISBN:
Category : Signs and signboards
Languages : en
Pages : 82
Book Description
The report reviews an experiment undertaken to examine the effectiveness of five sign treatments for controlling driver speeds in the vicinity of hazardous horizontal curves on rural two-lane highways. Signs examined ranged from the standard curve warning arrow to a regulatory speed zone sign in conjunction with a curve warning sign. Data collected during the experiment included both the following electronic and manual data: speeds of motorists as they approached and negotiated two horizontal curves, vehicle classification and registration information, and whether vehicles crossed over center and edge line markings.
An Evaluation of Warning and Regulatory Signs for Curves on Rural Roads
Author: R. W. LylesPublisher:
ISBN:
Category : Signs and signboards
Languages : en
Pages : 44
Book Description
The report reviews an experiment undertaken to examine the effectiveness of five sign treatments for controlling driver speeds in the vicinity of hazardous horizontal curves on rural two-lane highways. Signs examined ranged from the standard curve warning arrow to a regulatory speed zone sign in conjunction with a curve warning sign. Data collected during the experiment included both the following electronic and manual data: speeds of motorists as they approached and negotiated two horizontal curves, vehicle classification and registration information, and whether vehicles crossed over center and edge line markings.
Safety evaluation of improved curve delineation
Author: Publisher:
ISBN:
Category : Curves in engineering
Languages : en
Pages : 46
Book Description
The Federal Highway Administration (FHWA) organized a pooled fund study of 26 States to evaluate low-cost safety strategies as part of its strategic highway safety effort. One of the strategies chosen to be evaluated for this study was improving curve delineation. Geometric, traffic, and crash data were obtained at 89 treated curves in Connecticut and 139 treated curves in Washington to determine the safety effectiveness of improved curve delineation. Treatments varied by site and included new chevrons, horizontal arrows, and advance warning signs as well as the improvement of existing signs using fluorescent yellow sheeting. All sites were on two lane rural roads. To account for potential selection bias and regression to the mean, an Empirical Bayes (EB) before after analysis was conducted. The aggregate results revealed an 18% reduction in injury and fatal crashes, a 27.5% reduction in crashes during dark conditions, and a 25% reduction in lane departure crashes during dark conditions. The reductions were more prominent at locations with higher traffic volumes and sharper curves (curve radius less than 492 ft) and in locations with more hazardous roadsides (roadside hazard rating (RHR) of 5 or higher) compared to locations with less hazardous roadsides (RHR of 4 or lower). In addition, curves where more signs were either added or replaced (with a more retroreflective material) within the curve experienced larger reductions in crashes. An economic analysis revealed that improving curve delineation with signing improvements is a very cost effective treatment with the benefit cost ratio exceeding 8:1.
Field Evaluation of Selected Delineation Treatments on Two-lane Rural Highways
Author: Publisher:
ISBN:
Category : Road markings
Languages : en
Pages : 356
Book Description
The objectives of this research project were to establish relationships between traffic performance and accident probability on two-lane rural highways; to develop an experimental design for field testing the effectiveness of conventional and novel delineation treatments; to evaluate the effect of selected delineation treatments on traffic performance and associated accident probability; and to make recommendations for the design and use of delineation treatments.
Executive Summary and Abstract for the Report Entitled "An Evaluation of Warning and Regulatory Signs for Curves on Rural Roads."".
Author: R. W. LylesField Evaluation of Selected Delineation Treatments on Two-lane Rural Highways
Author: W. A. StimpsonPublisher:
ISBN:
Category : Road markings
Languages : en
Pages : 28
Book Description
An Evaluation of Signs for Sight-restricted Rural Intersections
Author: R. W. LylesCost-effectiveness and Safety of Alternative Roadway Delineation Treatments for Rural Two-lane Highways: Appendix A, site selection and data collection
Author: Publisher:
ISBN:
Category : Road markings
Languages : en
Pages : 68
Book Description
Under this research study, the effect of various delineation treatments on accident rates was assessed by analyzing accident data from more than 500 roadway sites in 10 States for tangent, winding and isolated horizontal curve sections on two-lane rural highways. Cost-benefit and cost models for evaluating specific delineation treatments were developed and guidelines formulated by executing the cost-benefit models for selected delineation treatments.