An Evaluation Study of the Effects of the Flashing Speed Limit Sign in School Zones PDF Download
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Author: Larry Eugene Greer
Publisher:
ISBN:
Category : Traffic signs and signals
Languages : en
Pages : 312
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Book Description
Author: Larry Eugene Greer
Publisher:
ISBN:
Category : Traffic signs and signals
Languages : en
Pages : 312
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Book Description
Author: Shauna L. Hallmark
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 8
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Book Description
This study documents the speed reduction impacts of two dynamic, electronic school zone speed limit signs at United Community Schools between Ames and Boone, Iowa. The school facility is situated along US Highway 30, a rural four-lane divided expressway. Due to concerns about high speeds in the area, the Iowa Department of Transportation (DOT) decided to replace the original static school zone speed limit signs, which had flashing beacons during school start and dismissal times, with electronic speed signs that only display the reduced school speed limit of 55 mph during school arrival and dismissal times. The Center for Transportation Research and Education (CTRE) at Iowa State University (ISU) conducted a speed evaluation study one week before and 1 month, 7 months, and 14 or 15 months after the new signs were installed. Overall, the new dynamic school zone speed limit signs were more effective in reducing speeds than the original static signs with flashing beacons in the 1 month after period. During the 7 and 14 month after period, speeds increased slightly for the eastbound direction of traffic. However, the increases were consistent with overall speed increases that occurred independent of the signs. The dynamic, electronic signs were effective for the westbound direction of traffic for all time periods and for both start and dismissal times. Even though only modest changes in mean and 85th percentile speeds occurred, with the speed decreases, the number of vehicles exceeding the school speed limit decreased significantly, indicating the signs had a significant impact on high-end speeders.
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.
Author: Joseph S. Koziol
Publisher:
ISBN:
Category : Speed limits
Languages : en
Pages : 160
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Book Description
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.
Author: Arshad Syed
Publisher:
ISBN:
Category : Traffic safety and children
Languages : en
Pages : 180
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Book Description
Author: Ohio State University. Graduate School
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1042
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Book Description
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.
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.
Author: R. F. Benekohal
Publisher:
ISBN:
Category : Automobile drivers
Languages : en
Pages : 84
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Book Description
This study evaluated the effects of police presence on the speed of vehicles in a work zone and determined the "halo" effects of police presence (lasting effects when police are gone) on vehicular speeds. A marked police car circulated in a 4-mile long interstate highway work zone and actively enforced the speed limit laws. Variables such as the average speed, speed distribution, percentage of fast-moving motorists, and net speed reductions for cars and trucks were used for evaluation. The results indicated that the average speeds of the cars and trucks were 4.3-4.4, and 4.3-5.0 mph, respectively, lower when police were patrolling the work zone compared to no-police patrol condition. The percentage of fast-moving cars and trucks before the work space decreased by 14% and 32%, respectively, when police were in the work zone. These speed reductions indicate that the police presence was effective in decreasing the speed of vehicles in the work zone. The police presence had halo effects on trucks but not on cars. Trucks traveled at reduced speed when police were present in the work zone and this trend of traveling at the reduced speed continued for a time period at least one hour after the police departed from the work zone. However, cars traveled 2. 4-3. o mph faster and the percentage of fast-moving cars in the work zone increased after the police left the area.
