Evaluation of Work Zone Speed Limit Signs with Strobe Lights

Evaluation of Work Zone Speed Limit Signs with Strobe Lights PDF Author: R. F. Benekohal
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 98

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Book Description
The construction zone speed limit sign used in Illinois consists of a regulatory 45 mph speed limit sign augmented with two small strobe lights and two orange colored plates. When the lights are flashing the speed limit is 45 mph. This report contains the findings from evaluation of the effectiveness of the flashing lights in reducing speeds in a rural interstate construction zone. The speed reduction effects on cars and trucks were determined at two locations within the work zone. The results indicated that the average speed of cars was reduced by 1.9-7.1 mph and that of trucks by 1.3-6.0 mph when the strobe lights were flashing. In general, the speed reduction effects were more pronounced on the cars than on the trucks, and at a location past the work space than before it. The reductions at the location past the work space were 2-3 times more than the reductions at the location before the work space. Cars reduced their speeds, on the average, by 1.9 to 4.9 mph before and by 5.9 to 7.1 mph after the work space. Similarly, the speed reduction for trucks was 1.3-2.9 mph before and 3.3-6.0 after the work space. In general, the percentages of vehicles with excessive speeds in the work zone decreased when the lights were flashing.

Evaluation of Work Zone Speed Limit Signs with Strobe Lights

Evaluation of Work Zone Speed Limit Signs with Strobe Lights PDF Author: R. F. Benekohal
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 98

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Book Description
The construction zone speed limit sign used in Illinois consists of a regulatory 45 mph speed limit sign augmented with two small strobe lights and two orange colored plates. When the lights are flashing the speed limit is 45 mph. This report contains the findings from evaluation of the effectiveness of the flashing lights in reducing speeds in a rural interstate construction zone. The speed reduction effects on cars and trucks were determined at two locations within the work zone. The results indicated that the average speed of cars was reduced by 1.9-7.1 mph and that of trucks by 1.3-6.0 mph when the strobe lights were flashing. In general, the speed reduction effects were more pronounced on the cars than on the trucks, and at a location past the work space than before it. The reductions at the location past the work space were 2-3 times more than the reductions at the location before the work space. Cars reduced their speeds, on the average, by 1.9 to 4.9 mph before and by 5.9 to 7.1 mph after the work space. Similarly, the speed reduction for trucks was 1.3-2.9 mph before and 3.3-6.0 after the work space. In general, the percentages of vehicles with excessive speeds in the work zone decreased when the lights were flashing.

Evaluation and Summary of Studies in Speed Control Methods in Work Zones

Evaluation and Summary of Studies in Speed Control Methods in Work Zones PDF Author: R. F. Benekohal
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 114

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Book Description
This report summarizes and evaluates the important findings from the literature review of the studies on work zone speed control techniques. The following treatments are included in this report: 1) flagging, 2) lane width reduction, 3) law enforcement, 4) changeable message signs (CMS), 5) rumble strips, and 6) flashing beacons. The effects of the speed control treatments on speed and traffic flow are evaluated based on: A) experiences with treatment, B) effects of treatment on speed, C) effectiveness of treatment, and D) comments about treatment. A brief description of the conditions under which the treatments were applied is provided, and the speed reduction effects of each technique are discussed. A reference matrix was prepared to identify publications related to each type of speed reduction treatment used in work zones.

Development and Evaluation of an Active Warning Device for School Bus Loading and Unloading Points in Areas of Limited Visibility

Development and Evaluation of an Active Warning Device for School Bus Loading and Unloading Points in Areas of Limited Visibility PDF Author:
Publisher:
ISBN:
Category : School buses
Languages : en
Pages : 112

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Book Description
The primary objectives of this research project were: (1) to develop an active advance warning device (AAWD) comprised of an actuated flashing beacon supplement to a conventional SCHOOL BUS STOP AHEAD sign (S3-1) and (2) to evaluate its effect on driver performance and safety through school bus loading and unloading zones. Secondary objectives were to summarize system components and costs, develop an activation strategy, review the liability risk, review national experience related to safety, and provide guidance regarding specifications and use in Texas. With respect to safety, 37 of 46 studies reported a positive effect resulting from AAWDs. Findings from field studies conducted in Texas also suggest favorable results with confirmed reductions in vehicle approach speeds when the flashing beacon was activated. Costs for the final AAWD are estimated to be 2,000 dollars for the S3-1 sign and flashing beacons and 2,600 dollars for the flashing beacon activation system, not including sign installation or ongoing maintenance and operations costs. A review of published literature and historic case law suggests minimal additional liability risk above what is already experienced by transportation departments. Unique areas of risk relate to "jurisdictional responsibility" for establishing, operating, and maintaining school bus loading and unloading zones and the hazard expectation tied to the flashing beacon activation (i.e., motorists may not exercise the same degree of caution when the bus is not present and the beacons are not flashing despite children being present at the bus stop). Given the favorable safety impacts, the low system cost, and the minimal additional liability risk incurred, the AA WD is recommended for further implementation.

Evaluation of Pedestrian Safety Policies and Practices on California State Highways

Evaluation of Pedestrian Safety Policies and Practices on California State Highways PDF Author: Julie Blue
Publisher:
ISBN:
Category : Pedestrians
Languages : en
Pages : 168

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Book Description
This document contains the nationwide "best practices" related to pedestrian transportation and safety. Contributions to the best practices included 50 State Departments of Transportation, the 50 largest U.S. cities, and 12 Metropolitan Planning Organizations. The document also presents a review of current practices of the California Department of Transportation (Caltrans) and compares them to other best practices. In addition to general recommendations, specific recommendations are given regarding practices that Caltrans should maintain, study, and implement.

Abstracts of Masters' Theses

Abstracts of Masters' Theses PDF Author: Ohio State University. Graduate School
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1042

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Compendium of Technical Papers

Compendium of Technical Papers PDF Author: Institute of Transportation Engineers. Meeting
Publisher:
ISBN:
Category : Traffic engineering
Languages : en
Pages : 488

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Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States

Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States PDF Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 536

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HRIS Abstracts

HRIS Abstracts PDF Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 592

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Master's Theses and Doctoral Dissertations in the Pure and Applied Sciences

Master's Theses and Doctoral Dissertations in the Pure and Applied Sciences PDF Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 188

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Literature Review on Vehicle Travel Speeds and Pedestrian Injuries

Literature Review on Vehicle Travel Speeds and Pedestrian Injuries PDF Author: W. A. Leaf
Publisher:
ISBN:
Category :
Languages : en
Pages : 138

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