Evaluation Of Traffic Controls For Highway Work Zones

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Estimating Exceedances And Design Values From Urban Ozone Monitoring Network Data

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Author : Marc F. Roddin
language : en
Publisher:
Release Date : 1981

Estimating Exceedances And Design Values From Urban Ozone Monitoring Network Data written by Marc F. Roddin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Air categories.

Evaluation Of Traffic Controls For Street And Highway Work Zones

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Author : Roger G. Petzold
language : en
Publisher:
Release Date : 1978

Evaluation Of Traffic Controls For Street And Highway Work Zones written by Roger G. Petzold and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Roads categories.

Evaluation And Summary Of Studies In Speed Control Methods In Work Zones

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Author : R. F. Benekohal
language : en
Publisher:
Release Date : 1992

Evaluation And Summary Of Studies In Speed Control Methods In Work Zones written by R. F. Benekohal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Roads categories.

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.

Evaluation Of Traffic Control Devices For Rural High Speed Maintenance Work Zones Second Year Activities And Final Recommendations

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Author : Michael D. Fontaine
language : en
Publisher:
Release Date : 2000

Evaluation Of Traffic Control Devices For Rural High Speed Maintenance Work Zones Second Year Activities And Final Recommendations written by Michael D. Fontaine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Road construction workers categories.

Evaluation Of Steady Burn Lights For Traffic Controls In Highway Work Zones

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Author : Prahlad D. Pant
language : en
Publisher:
Release Date : 1989

Evaluation Of Steady Burn Lights For Traffic Controls In Highway Work Zones written by Prahlad D. Pant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Roads categories.

Evaluation Of Steady Burn Lights For Traffic Control In Highway Work Zones Phase Ii

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Author : Prahlad D. Pant
language : en
Publisher:
Release Date : 1992

Evaluation Of Steady Burn Lights For Traffic Control In Highway Work Zones Phase Ii written by Prahlad D. Pant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Reflectors (Safety devices) categories.

Evaluation Of Traffic Control Countermeasures To Improve Speed Limit Compliance In Work Zones On High Speed Roadways

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Author : Daniel D. Mason
language : en
Publisher:
Release Date : 2013

Evaluation Of Traffic Control Countermeasures To Improve Speed Limit Compliance In Work Zones On High Speed Roadways written by Daniel D. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Road work zones categories.

"Slowing motorists within work zones on high-speed roadways continues to be a challenge for highway operators in all jurisdictions. The New Brunswick Department of Transportation and Infrastructure (NBDTI) utilizes procedures outlined in the Work Area Traffic Control Manual (WATCM) to manage speeds within work zones. The WATCM states the posted limit in work zones may not be more than 20 km/h less than the prevailing posted limit due to previous research indicating a larger reduction will increase the risk of collision. Workers on high-speed facilities are exposed to speeds of 90 km/h and greater. This study aims to identify traffic control countermeasures that will allow a further reduction below 90 km/h while maintaining speed limit compliance. The countermeasures tested included each, as well as combinations, of the following: Floating Speed Zones (FSZ); Traffic Control Person (TCP); Narrow Lanes; Radar Speed Display Board (RSDB); Variable Message Sign (VMS); Fake Police Vehicle. The top ranked countermeasures in terms of speed reduction were found to be the following combinations: the TCP and the FSZ; the Fake Police Vehicle and the FSZ; and the RSDB and the FSZ. The TCP/ FSZ, Fake Police Vehicle/ FSZ and the RSDB/ FSZ resulted in mean speed reductions of 23 km/h, 19 km/h and 19 km/h, respectively. Implementation of the countermeasures did not significantly increase speed variance. It is recommended that NBDTI incorporate a provision within the WATCM to allow reductions to 70 km/h as long as a RSDB or a TCP is used as a supplemental countermeasure."--Page ii.

Evaluation Of Chevron Patterns For Use On Traffic Control Devices In Street And Highway Work Zones

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Author : B. H. Cottrell (Jr)
language : en
Publisher:
Release Date : 1980

Evaluation Of Chevron Patterns For Use On Traffic Control Devices In Street And Highway Work Zones written by B. H. Cottrell (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.

Improving Traffic Flow Conditions For Interstate Work Zones

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Author : Nawaz M. Shaik
language : en
Publisher:
Release Date : 2005

Improving Traffic Flow Conditions For Interstate Work Zones written by Nawaz M. Shaik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Electronic dissertations categories.

Highway departments, which are responsible for maintenance of different highway facilities, have the continuing responsibility to make the highway as safe and efficient as possible. Traffic control approaching and within a work-zone is a major concern for these departments. The objective of this study was to test three traffic control devices white lane drop arrows, orange rumble strips, and the CB wizard alert system for their effectiveness in improving merging, and reducing speed and speed variance at an interstate highway work-zone in Missouri. Statistical tests were conducted on the speed related data collected along the approach to the work-zone lane closure when the devices were not in place and when they were in place. Results of implementing the white lane drop arrows and the CB wizard alert system indicate decreases in the percentage of vehicles in the closed lane, mean speed and speed variance. It also appears that the CB wizard alert system may be more effective than the white lane drop arrows. The CB wizard alert system in conjunction with the orange rumble strips did show similar reductions, but they were much smaller in comparison to the CB wizard alert system alone.

Work Zone Safety Assessment And Throughput Analysis For High Volume Highways Using Random Parameter Models

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Author : Seyedata Nahidi
language : en
Publisher:
Release Date : 2019

Work Zone Safety Assessment And Throughput Analysis For High Volume Highways Using Random Parameter Models written by Seyedata Nahidi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

Highways and freeways could be considered the most important transportation infrastructure in North America; these vital routes are necessary for the efficient haulage of huge amounts of goods and services. Several factors such as the high volume of heavy truck traffic as well as harsh winters in this region could result in a faster deterioration rate of the transportation infrastructures, specifically pavements. Transportation agencies, under the supervision of municipalities, are responsible to maintain, preserve, and reconstruct these segments. Applying the proper care results in a significant reduction in the number of observed conflicts and collisions on high-volume highways. Washington State Department of Transportation defines a work zone as, "...an area of a roadway with construction, maintenance, or utility work activities. A work zone is typically marked by signs, channelizing devices, barriers, pavement markings, and/or work vehicles." Based on previously conducted studies, work zones can significantly interrupt the regular traffic flow on highways. These interruptions can have adverse effects on the safety of the roads and increase the likelihood of undesirable conflicts and collisions. To avoid any unexpected work zone related safety concerns, Departments of Transportation in the US, as well as Ministries of Transportation in Canada, encourage agencies to propose detailed plans to minimize the queuing period and injury severity of work zone collisions; the most common strategy is to set up work zones at nighttime. Independent reports by the Ministry of Transportation Ontario (MTO) also identified that predicting the throughput, and the queuing length, as well as the queuing period, can significantly improve the planning stage, reduce the user delay costs, and increase work zone safety for workers and motorists. Statistical analyses and modelling are methods used to acquire information from historical data sets and gain a more realistic insight into future events with an acceptable confidence level. This research involves the statistical evaluation of work zones' safety and performance, along with comprehensive analyses of work zones' throughput in North America. To evaluate the different strategies, Multiple Linear Regression (MLR) and Negative Binomial Regression (NBR) models were developed to identify the critical historical factors which affect the traffic throughput of work zones. For safety assessment of work zones, innovative random parameter approaches were adapted in combination with ordered probability models to produce robust and realistic results. Furthermore, the practicality and applicability of random parameter models were discussed to clarify the advantages of using these models. Random Parameter Negative Binomial (RPNB) and Random Parameter Ordered Logit (RPOL) models developed in this study were found to be the most accurate models for throughput and safety analysis, respectively. Also, the implementation of k-fold cross validation proved that the model predictions correlated well with historical data. Finally, a new approach for Random Parameter prediction was proposed which considers the similarity level between a potential event and historical data. Based on these evaluations, the overall feasibility of each strategy was examined. The results denoted several practical recommendations to decrease traffic congestion and create safer work zones. The random parameter negative binomial model for throughput analysis showed that to avoid queuing in work zones where there are two or more obstructed lanes, multiple short (less than 3 km) work zones are more efficient than longer ones; this factor increases the frequency of passing vehicles by 177 per hour per lane. Besides, weekend nights are found to be the most appropriate time to set up work zones. It is observed that weekend nighttime work zone set-ups increase the number of passing vehicles by 493 vehicles per hour per lane compared to other scenarios. In general, nighttime closures, occurring on any day during the week, are found to have a higher discharge rate in comparison with daytime closures. On highways with more than 20% truck traffic, it is expected to have 102 fewer vehicles passing through work zones due to the induced congestion. Similarly, random parameter ordered probability models identified several factors which are shown to have a statistically significant impact on work zone collisions' injury severity level. As an example, aggressive driving behaviours, e.g. failing to keep in the proper lane, running other drivers off the road, and tailgating, increase the major injury and fatal collisions' likelihood by 78%. The installation of traffic control devices, specifically warning signs, reduce the probability of fatalities by 14%. Moreover, alcohol and drug consumption increase the probability of fatal and major injury collisions by 36% based on random parameter ordered Logit model, so by enforcing strict laws many lives can be saved. After analysis, common practices and the author's recommendations for each significant factor in the selected models are discussed. Primarily, the prohibition of truck traffic, designing efficient detours, and installation of extra and more innovative traffic control devices prior to the work zones are recommended. It was also concluded that the most efficient way to have a safe and comfortable environment in work zones on high-volume highways is to encourage government, engineers, and motorists to collaborate. Collaboration could take the form of the public awareness campaigns, setting and enforcing effective laws and regulations, and assuring the proper implementation of existing guidelines. Last but not least, the accurate prediction of work zone throughput frequency at queuing time provided an appropriate context for better work zone planning to reduce the possible user delay cost. The outcome of this research was the development of a novel planning and decision-making tool (`smart form') to help engineers and contractors to evaluate the work zone safety of high-volume highways in North America.