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OTREC-RR-11-18 By Karen Dixon
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This research sought to evaluate the safety implications of advisory speeds at horizontal curves on Oregon rural two-lane highways. The goal of this research is to characterize driving at such curves... More > with advisory speed signs, and to determine what role the signs play in enhancing safety. Speed and signage compliance data was collected at 16 sites. Site crash data and an examination of how advisory speed relates to historic crash information are included with a statistical model that identifies critical variables associated with the posted speed and how they relate to the expected crash frequency. An advisory speed model was developed to assess predicted crash outcomes based on geometric design, operations, and signage. The resulting model was compared to advisory speeds based on Oregon policy and 2009 MUTCD thresholds. The safety-based model predicted advisory speeds that are less conservative than those recommended by the ball-bank thresholds in the 2009 MUTCD or the thresholds Oregon has been using.< Less
OTREC-RR-11-18 By Karen Dixon
eBook (PDF): $0.00
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This research sought to evaluate the safety implications of advisory speeds at horizontal curves on Oregon rural two-lane highways. The goal of this research is to characterize driving at such curves... More > with advisory speed signs, and to determine what role the signs play in enhancing safety. Speed and signage compliance data was collected at 16 sites. Site crash data and an examination of how advisory speed relates to historic crash information are included with a statistical model that identifies critical variables associated with the posted speed and how they relate to the expected crash frequency. An advisory speed model was developed to assess predicted crash outcomes based on geometric design, operations, and signage. The resulting model was compared to advisory speeds based on Oregon policy and 2009 MUTCD thresholds. The safety-based model predicted advisory speeds that are less conservative than those recommended by the ball-bank thresholds in the 2009 MUTCD or the thresholds Oregon has been using.< Less
OTREC-RR-11-18 By Karen Dixon
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This research sought to evaluate the safety implications of advisory speeds at horizontal curves on Oregon rural two-lane highways. The goal of this research is to characterize driving at such curves... More > with advisory speed signs, and to determine what role the signs play in enhancing safety. Speed and signage compliance data was collected at 16 sites. Site crash data and an examination of how advisory speed relates to historic crash information are included with a statistical model that identifies critical variables associated with the posted speed and how they relate to the expected crash frequency. An advisory speed model was developed to assess predicted crash outcomes based on geometric design, operations, and signage. The resulting model was compared to advisory speeds based on Oregon policy and 2009 MUTCD thresholds. The safety-based model predicted advisory speeds that are less conservative than those recommended by the ball-bank thresholds in the 2009 MUTCD or the thresholds Oregon has been using.< Less
OTREC-RR-12-02 By Karen Dixon et al.
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The Highway Safety Manual (HSM) published by the American Association of State Highway and Transportation Officials in the spring of 2010 includes safety predictive methods which are used to estimate... More > the safety of a transportation facility. However, the safety performance functions (SPFs) were developed for states other than Oregon. Because of differences in crash reporting, driver and animal populations, and weather conditions, officials need calibrated SPFs for Oregon facilities. Predictive methods were developed for rural two-lane roads, rural multilane roads, and urban/suburban arterial roads. In this project SPFs were calibrated for these facility types based on their historic performance in Oregon. The report illustrates methods of site selection, collection of crash and site data, analysis methods, and an evaluation of crash severity distribution methods. Oregon agencies can use calibrated HSM predictive methods to more accurately assess expected facility safety performance for Oregon conditions.< Less
OTREC-RR-12-02 By Karen Dixon et al.
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The Highway Safety Manual (HSM) published by the American Association of State Highway and Transportation Officials in the spring of 2010 includes safety predictive methods which are used to estimate... More > the safety of a transportation facility. However, the safety performance functions (SPFs) were developed for states other than Oregon. Because of differences in crash reporting, driver and animal populations, and weather conditions, officials need calibrated SPFs for Oregon facilities. Predictive methods were developed for rural two-lane roads, rural multilane roads, and urban/suburban arterial roads. In this project SPFs were calibrated for these facility types based on their historic performance in Oregon. The report illustrates methods of site selection, collection of crash and site data, analysis methods, and an evaluation of crash severity distribution methods. Oregon agencies can use calibrated HSM predictive methods to more accurately assess expected facility safety performance for Oregon conditions.< Less
OTREC-RR-13-03 By Karen Dixon, Xiang Yi, Lacy Brown
Paperback: $5.36
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This report reviews development of an Oregon Access Management Best Practices Manual. In particular, this effort develops a resource to help transportation professionals quantify safety and... More > operational effects of various access management strategies, provide measurable criteria to evaluate access management techniques, and identify data collection practices needed to perform these assessments. This manual is designed to be used by engineers, decision makers, and educators to help the transportation community better understand how to apply access management strategies and how to quantify benefits of various access management options. This report includes a literature review of safety and operational benefits for a variety of access management configurations. The benefits summary discusses perceived and measured economic impacts of access management, something not explicitly included in the companion manual. This report summarizes sample data for access management and includes a proposed best practices manual.< Less
OTREC-RR-13-03 By Karen Dixon, Xiang Yi, Lacy Brown
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This report reviews development of an Oregon Access Management Best Practices Manual. In particular, this effort develops a resource to help transportation professionals quantify safety and... More > operational effects of various access management strategies, provide measurable criteria to evaluate access management techniques, and identify data collection practices needed to perform these assessments. This manual is designed to be used by engineers, decision makers, and educators to help the transportation community better understand how to apply access management strategies and how to quantify benefits of various access management options. This report includes a literature review of safety and operational benefits for a variety of access management configurations. The benefits summary discusses perceived and measured economic impacts of access management, something not explicitly included in the companion manual. This report summarizes sample data for access management and includes a proposed best practices manual.< Less