Performance Implications of Bicycle Specific Treatments at Signalized Intersections PDF Download
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Author:
Publisher:
ISBN:
Category : Bicycle commuting
Languages : en
Pages : 36
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Book Description
A rise in cycling nationwide has brought an increased awareness of bicycle specific safety concerns, particularly right-hook crashes at signalized intersections. There are several common and emerging signal timing strategies that are can be used to improve the safety and efficiency of traffic signals for people on bicycles, including the Leading Bicycle Intervals (LBI), Split LBI, and Exclusive Bicycle Phasing (EBP). To examine the performance and efficiency metrics under a range of bicycle and motor vehicle volumes, a Vissim microsimulation model was developed. Passenger cars, large trucks, bicycles, and pedestrians were modeled to understand the performance across and between the modes. User delay values were extracted from the model and compared to the base case. A total of 210 simulation runs were conducted, accounting for approximately 262.5 hours of simulation. This research demonstrates that bicycle specific treatments do impact user delay at busy arterial intersections, although the magnitude of impact differs depending on the treatment used. The use of the Split LBI had little overall impact, suggesting it is an effective treatment if the intersection configuration is correct. The LBI had greater impact, and should be considered for intersections with the correct configuration. The EBP had large delay increases suggesting limited use, only when bicycle volumes are high enough to justify the delay.
Author:
Publisher:
ISBN:
Category : Bicycle commuting
Languages : en
Pages : 36
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Book Description
A rise in cycling nationwide has brought an increased awareness of bicycle specific safety concerns, particularly right-hook crashes at signalized intersections. There are several common and emerging signal timing strategies that are can be used to improve the safety and efficiency of traffic signals for people on bicycles, including the Leading Bicycle Intervals (LBI), Split LBI, and Exclusive Bicycle Phasing (EBP). To examine the performance and efficiency metrics under a range of bicycle and motor vehicle volumes, a Vissim microsimulation model was developed. Passenger cars, large trucks, bicycles, and pedestrians were modeled to understand the performance across and between the modes. User delay values were extracted from the model and compared to the base case. A total of 210 simulation runs were conducted, accounting for approximately 262.5 hours of simulation. This research demonstrates that bicycle specific treatments do impact user delay at busy arterial intersections, although the magnitude of impact differs depending on the treatment used. The use of the Split LBI had little overall impact, suggesting it is an effective treatment if the intersection configuration is correct. The LBI had greater impact, and should be considered for intersections with the correct configuration. The EBP had large delay increases suggesting limited use, only when bicycle volumes are high enough to justify the delay.
Author: Lee August Rodegerdts
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 376
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Book Description
This guide provides a single, comprehensive document with methods for evaluating the safety and operations of signalized intersections and tools to remedy deficiencies. The treatments in this guide range from low-cost measures such as improvements to signal timing and signage, to high-cost measures such as intersection reconstruction or grade separation. Topics covered include fundamental principles of user needs, geometric design, and traffic design and operation; safety and operational analysis techniques; and a wide variety of treatments to address existing or projected problems, including individual movements and approaches, pedestrian and bicycle treatments, and corridor techniques. It also covers alternative intersection forms that improve intersection performance through the use of indirect left turns and other treatments. Each treatment includes a discussion of safety, operational performance, multimodal issues, and physical and economic factors that the practitioner should consider. Although the guide focuses primarily on high-volume signalized intersections, many treatments are applicable for lower volume intersections as well. The information contained in this guide is based on the latest research available on treatments and best practices in use by jurisdictions across the United States. Additional resources and references are highlighted for the student, practitioner, researcher, or decisionmaker who wishes to learn more about a particular subject.
Author: Jennifer Lynn Warner
Publisher:
ISBN:
Category : Cycling accidents
Languages : en
Pages : 186
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Book Description
A right-hook crash is a bicycle-motor vehicle crash between a right-turning motor vehicle and an adjacent through-moving bicycle. This study focuses on right-hook crashes that occur during the latter stage of the circular green indication at signalized intersections with shared right-turn and through lanes. The overall objective was to evaluate and identify engineering treatments that are effective in reducing the frequency and severity of right-hook crashes. The areas of engineering treatments that were considered are as follows: signage, pavement markings, curb radii, and protected intersections. The driver performance measures include visual attention, crash avoidance, and potential crash severity. The resulting analysis suggests that while these various driver performance metrics can be measured robustly, and all of the treatments had some positive effect on measured driver performance, it is not yet clear how to map the magnitudes of the differences to expected crash outcomes. Additional work is recommended to address the limitations of this study and to further consider the potential effects of the right-hook crash mitigation strategies from this research.
Author: Ezra Hauer
Publisher:
ISBN:
Category :
Languages : en
Pages : 305
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Transportation Research Record contains the following papers: Pedestrian travel potential in northern New Jersey : a metropolitan planning organization's approach to identifying investment priorities (Matley, TM, Goldman, LM and Fineman, BJ); Calibrating pedestrian level-of-service metrics with 3-D visualization (Miller, JS, Bigelow, JA and Garber, N); Power of the line : shared-use path conflict reduction (Jordan, G and Leso, L); Analysis of pedestrian gait and perception-reaction at signal-controlled crosswalk intersections (Fugger, TF, Randles, BC, Stein, AC and Gallagher, B); Effects of traffic calming measures on pedestrian and motorist behavior (Huang, HF and Cynecki, MJ); Automated detection of pedestrians in conjunction with standard pedestrian push buttons at signalized intersections (Hughes, R, Huang, H, Zeeger, C and Cynecki, M); Locator tones for pedestrian signals (Bentzen, BL, Barlow, JM and Gubbe, D); Effects of innovative pedestrian signs at unsignalized locations : three treatments (Huang, H, Zegeer, C and Nassi, R); Sidewalk cross-slope requirements of the American with disabilities act : literature review (Kockerlman, K, Zhao, Y, Heard, L, Taylor, D and Taylor B); New modeling approach for mixed-traffic streams with nonmotorized vehicles (Oketch, TG); Modeling of bicycle road network plan (Hyodo, T, Suzuki, N and Takahashi, K); Cycling and urban traffic management and control systems (Clark, SD and Page, MW); Coordinating traffic signals for bicycle progression (Taylor, DB and Mahmassani, HS); Analysis of gap patterns in longitudinal rumble strips to accommodate bicycle travel (Moeur, RC); Evaluation of innovative bike-box application in Eugene, Oregon (Hunter, WW); Evaluation of blue bike-lane treatment in Portland, Oregon (Hunter, WW, Harkey, DL and Stewart, JR); Influence of experimental pavement markings on urban freeway exit-ramp traffic speeds (Retting, RA, McGee, HW and Farmer, CM).
Author:
Publisher:
ISBN:
Category : Bicycle lanes
Languages : en
Pages : 95
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A before-and-after analysis was performed at eleven intersections where a bike box was installed in Portland, Oregon to explore the safety effects of the treatment. Video data were gathered prior to installation at 14 intersections where a bike box installation was planned by the Portland Bureau of Transportation. Cameras were set up to capture three full twenty-four hour days (72 hours) of data for each intersection from Tuesday through Thursday. Of the 14 original selected intersections, 11 intersections actually received the bike box treatment. Video data were again gathered for these intersections after the installation of the bike box for another three full twenty-four hour days (72 hours) between Tuesday and Thursday. One day of data (24 hours) was selected for observation from both the before and after periods in the analysis for each study intersection during midweek. Safety effects were evaluated by three metrics: 1) observed conflicts; 2) observed cyclist behavior for all conflicts as measured by head or shoulder checks; and 3) reported crash data. To develop the conflict data, a log was created of each motor vehicle and bicycle passing through the intersection for approximately 528 hours of video. All conflicts that were observed during the period were further reviewed by an expert panel that scored conflicts by severity. Following this review, a total of 18 conflicts were observed during the before period. The total exposure in the before period was 39,497 motor vehicles in the vehicle lane adjacent to the bike lane (10,454 of which were right-turning) and 7,849 bicycles. A total of 19 conflicts were observed during the after period. Total exposure was 42,381 motor vehicles in the vehicle lane adjacent to the bike lane (11,053 of which were right-turning) and 5,852 bicycles. The sample size of observed conflicts was insufficient to draw statistically significant conclusions for any of the specific intersections that were treated. When taking in account the total amount of conflicts, the limited data suggest a slight increase in the rate of conflicts when normalized against a product of right-turning vehicles and bicycles observed in the intersection. The data also suggest that the installation of a bike box at an intersection reduces the rate of conflicts per hundred motor vehicles and increases the rate of conflicts per hundred bicyclists. Data regarding head-checks from the bicyclist shows an increase in bicyclists observing the possibility of conflicts approaching from behind as they pass through the intersection. A review or crash data at each of the intersections shows an increase at three of the observed intersections and a decrease at the remaining five.
Author:
Publisher: AASHTO
ISBN: 1560512717
Category : CD-ROMS.
Languages : en
Pages : 142
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Author: Charles V. Zegeer
Publisher: DIANE Publishing
ISBN: 1428995501
Category : Pedestrian accidents
Languages : en
Pages : 164
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Book Description
This guide is intended to provide information on how to identify safety and mobility needs for pedestrians with the roadway right-of-way. Useful for engineers, planners, safety professionals and decision-makers, the guide covers such topics as: the Walking Environment including sidewalks, curb ramps, crosswalks, roadway lighting and pedestrian over and under passes; Roadway Design including bicycle lanes, roadway narrowing, reducing the number of lanes, one-way/two-way streets, right-turn slip lanes and raised medians; Intersections with roundabouts, T-intersections and median barriers; and Traffic calming designs.
Author:
Publisher:
ISBN:
Category : Cycling
Languages : en
Pages : 17
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Author: Dennis Patrick Allen
Publisher:
ISBN:
Category :
Languages : en
Pages : 216
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